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Monday, January 26, 2015

Dept. of Physicists Can Do Stuff: Harold Brown

Ashton Carter won't be the first physicist to lead the Department of Defense. Harold Brown was President of Caltech and Secretary of Defense under Carter.

Caltech Oral History interview:
BROWN: You asked me first for a brief review of my career before coming to Caltech. I grew up in New York [City] and went to Columbia University for my undergraduate and graduate degrees, all of them in physics. As a result of acceleration during the war years, I was not quite eighteen when I got my bachelor’s degree in 1945. But then I was somewhat tardy in getting graduate degrees. It took me about four years more to get my PhD. That was in nuclear physics. The area I actually worked on was beta-ray spectroscopy.

... Early in my graduate career, I saw that some of the other graduate students were going to do better in pure science than I, maybe because they were smarter or better researchers, but at least as much, it seemed to me, because they were able to focus very, very strongly on a narrow piece of research that they were doing. And it’s often been said that Nobel Prizes are won by people partly through brilliance but largely through a combination of an ability to focus very narrowly and to have an unhappy family life. [Laughter] Those things may go together to produce the intensity that, in addition to brilliance, creates Nobel Prize winners. I concluded that I was not going to be able to focus that strongly because I had too many other interests. That drew me away from theoretical and toward experimental physics first, and then toward applied science, and then toward managing. So I think it may have been a combination of that sort.

... I found Christy’s attitude very interesting. Christy, of course, is a theoretical physicist. [See The Christy Gadget.] But when I asked him ... he said that he had always found that there were applied problems that had as much inherent intellectual interest [as those relating more to “pure” science]. And if they met that criterion, he was perfectly willing, and felt others should be willing, to look to such applied problems where they had important impacts, economically, environmentally, or whatever. There were enough other faculty people who felt the same way, so we were able to do some of these things.

... There was, I think, a severe split among the faculty on this matter. ... A good many of the science and engineering faculty regard social scientists with much more hostility than they regard humanists—partly because they feel that the word “science” in social science is a lie and see it as an attempt to appropriate some of the prestige that correctly applies to the physical, biological, and mathematical sciences and even to technology and engineering. A good many of the science faculty say that whereas the humanities have a distinct different dimension to bring to bear, social science is pseudoscience and that any relationship to “science” is nonsense. That attitude created some interesting faculty meetings. But in retrospect, I can’t say that that prevented the institute from going ahead and making social-science appointments, or that the social scientists were driven away by this attitude. The best and most prominent of them have quite as much self-esteem as many scientists and engineers, although not as much as some of Caltech’s scientists.

... The economists, in particular, were perhaps at the cutting edge of this dispute. In many ways, they are the most prestigious of social scientists, because they purport to be able to predict or influence the real world more nearly the way scientists and engineers do, than can the sociologists or the anthropologists. At Caltech, many of those who were skeptical about them — and in this I tended to share their skepticism to some degree — said, “The economists who have the most academic prestige and win Nobel Prizes are the ones who are most analytical and pretend to be most like the scientists.” In fact, of course, in order to be analytical, they have to assume away most of the driving forces in real economic behavior. By creating the ideal economic man, they eliminate all the real psychology, and that’s what determines economic behavior.

... One thing I learned from Caltech—it wasn’t the first time I learned it, but I learned it perhaps in intensified form—is that an institution depends on a number of very high-quality people. That number can be small or large. I don’t think I had been at a place before that had quite such a concentration of intellectual power in a not-so-narrow—but not universal, either— area of human ability. It reinforced in me the belief that people who are very good at what they do are likely to be more understanding of other people’s talents than people who aren’t very good at what they do and who therefore try to do other things that they’re not very good at either.
Another interview from the archives:
LEVIN: When you came to Caltech, what did you expect from the Caltech undergraduate? What did you expect him to be-aside from his academic capability? Have you been surprised or disappointed in any way?

BROWN: I had been told about Caltech students' practical jokes, and I have seen some of those come off pretty well. I had been told that quite aside from their academic proficiency, they were also very, very intelligent - which is not the same thing. They are very good at spotting flaws in arguments, any arguments, and they are not easily put off by authoritative but incorrect statements. And I have been quite satisfied, pleased, and impressed with what I have seen. I would add that Caltech undergraduates have turned out to be somewhat less self-assured and socially at ease than I had expected. But that has a certain charm; it's not a total loss.

Astrophysical Repulsion from Dark Energy

The manifestation of dark energy on cosmological scales is well known: gravitational repulsion which leads to the accelerating expansion of the universe. Perhaps surprisingly, there are potentially observable effects on galactic length scales as well.
The Dark Force: Astrophysical Repulsion from Dark Energy (

Chiu Man Ho, Stephen D. H. Hsu

Dark energy (i.e., a cosmological constant) leads, in the Newtonian approximation, to a repulsive force which grows linearly with distance. We discuss possible astrophysical effects of this "dark" force. For example, the dark force overcomes the gravitational attraction from an object (e.g., dwarf galaxy) of mass $10^7 M_\odot$ at a distance of $~ 23$ kpc. It seems possible that observable velocities of bound satellites (rotation curves) could be significantly affected, and therefore used to measure the dark energy density.

Wednesday, January 21, 2015

Seasons and Veritas

Harvard graduates explain why we have seasons. If only their understanding matched their confidence.

See also Why is it dark at night?  ,  Inside HBS: "kill, f^^k or marry"  ,  Frauds!  and
High V, Low M: ... high verbal ability is useful for appearing to be smart, or for winning arguments and impressing other people, but it's really high math ability that is useful for discovering things about the world -- that is, discovering truth or reasoning rigorously.

Tuesday, January 20, 2015

Venture capital in the 1980s

Via Dominic Cummings (@odysseanproject), this long discussion of the history of venture capital, which emphasizes the now largely forgotten 1980s. VC in most parts of the developed world, even large parts of the US, resembles the distant past of the above chart. There is a big gap between Silicon Valley and the rest.
Heat Death: Venture Capital in the 1980s

... Risk is uncertainty about the future. High technical risk means not knowing if a technology will work. High market risk means not knowing if there will be a market for your product. These are the primary risks that the VC industry as a whole contemplates. (There are other risks extrinsic to individual companies, like regulatory risk, but these are less frequent.)

Each type of risk has a different effect on VC returns. Technical risk is horrible for returns, so VCs do not take technical risk. There are a handful of examples of high technical risk companies that had great returns–Genentech43, for example–but they are few44. Today, VCs wait until there is a working prototype before they fund, but successful VCs have always waited until the technical risk was mitigated. Apple Computer, for example, did not have technical risk: the technology worked before the company was funded.

Market risk, on the other hand, is directly correlated to VC returns. When Apple was funded no one had any way of knowing how many people would buy a personal computer; the ultimate size of the market was analytically unknowable. DEC, Intel, Google, etc. all went into markets that they helped create. High market risk is associated with the best VC investments of all time. In the late ’70s/early ’80s and again in the mid to late ’90s VCs were comfortable funding companies with mind-boggling market risk, and they got amazing returns in exchange. In the mid to late ’80s they were scared and funded companies with low market risk instead, and returns were horrible.

Today is like the 1980s. There are a plethora of me-too companies, companies with a new angle on a well-understood market, and companies founded with the hopes of being acquired before they need to bring on many customers. VCs are insisting on market validation before investing, and are putting money into sectors that have already seen big exits (a sign of a market that has already emerged.)

Saying VCs used to take high technical risk and now take high market risk is both an overly optimistic view of the past–the mythical golden age of heroic VCs championing the development of new technologies–and an overly optimistic view of the present–gutsy VCs funding radical innovations that create entirely new markets. Neither of these things is true. VCs have never funded technical risk and they are not now funding market risk45. The VC community is purposely avoiding risk because we think we can make good returns without taking it. The lesson of the 1980s is that no matter how appealing this fantasy is, it’s still a fantasy.

Monday, January 19, 2015

16 years of training

Joe Rogan (UFC commentator) receives his BJJ black belt from Eddie Bravo.

Now go train jiujitsu.

Sunday, January 18, 2015

Measuring college learning outcomes: psychometry 101

Pressure is growing for outcomes testing in higher education. Already hundreds of schools allow graduating seniors to take the CLA+ (Collegiate Learning Assessment Plus) as evidence of important job skills. I doubt that the CLA+ adds much information concerning an applicant's abilities beyond what can be obtained from existing cognitive tests such as SAT, ACT, GRE. But those tests have plenty of enemies, creating a business opportunity for shiny new assessments. The results covered below will contain no surprises to anyone modestly familiar with modern psychometrics.
Forbes: More people than ever are asking the question: is college worth it? Take a look at the numbers: 81 percent of respondents in a 2008 survey of the general public agreed that a college education was a good investment, but that number was down to 57 percent in 2012. A recent Wells Fargo study reported that one-third of Millennials regret going to college, and instead say they would have been better off working and earning money. This rhetoric is reflected in the reality of declining enrollment: one survey of colleges showed that enrollment for spring 2013 was down 2.3 percent from spring 2012, a trend that has held for consecutive years.

Meanwhile, the wave of keeping colleges accountable for their outcomes continues to crest, even from the left. A recent Brookings Institution study concluded, “While the average return to obtaining a college degree is clearly positive, we emphasize that it is not universally so.” President Obama, a major recipient of plaudits and campaign dollars from the academic left, has called for a government-authored set of rankings for American colleges and universities that rewards performance and punishes failure: “It is time to stop subsidizing schools that are not producing good results, and reward schools that deliver for American students and our future,” he said.

President Obama’s impulse to define and reward value in higher education was correct, but a government-rankings system is not a sufficient corrective for the enormity of the problem. There is no panacea for reforming higher education, but the CLA+ exam has potential to be a very useful step. ...
More from the Wall Street Journal.
WSJ: A survey of business owners to be released next week by the American Association Colleges and Universities also found that nine out of 10 employers judge recent college graduates as poorly prepared for the work force in such areas as critical thinking, communication and problem solving.

“Employers are saying I don’t care about all the knowledge you learned because it’s going to be out of date two minutes after you graduate ... I care about whether you can continue to learn over time and solve complex problems,” said Debra Humphreys, vice president for policy and public engagement at AAC&U, which represents more than 1,300 schools.

The CLA+ [Collegiate Learning Assessment Plus] is graded on a scale of 400 to 1600. In the fall of 2013, freshmen averaged a score of 1039, and graduating seniors averaged 1128, a gain of 89 points.

CAE says that improvement is evidence of the worth of a degree. “Colleges and universities are contributing considerably to the development of key skills that can make graduates stand out in a competitive labor market,” the report said.

Mr. Arum was skeptical of the advantages accrued. Because the test was administered over one academic year, it was taken by two groups of people. A total of 18,178 freshmen took the test and 13,474 seniors. That mismatch suggested a selection bias to Mr. Arum.

What exactly are these college learning assessments? They measure general skills that employers deem important, but not narrow subject matter expertise -- some of which is economically valuable (e.g., C++ coding) and some much less so (e.g., detailed knowledge about the Reformation). Of course, narrow job-essential knowledge can be tested separately.
What Does CLA+ Measure?

CLA+ [Collegiate Learning Assessment Plus] is designed specifically to measure critical-thinking and written-communication skills that other assessments cannot. CAE has found that these are the skills that most accurately attest to a student’s readiness to enter the workforce. In the era of Google, the ability to recall facts and data is not as crucial as it once was. As our technology evolves to meet certain needs of the workplace, so too must our thinking about success and career readiness. Therefore, the skills taught in higher education are changing; less emphasis is placed on content-specific knowledge, and more is placed on critical-thinking skills, such as scientific and quantitative reasoning, analysis and problem solving, and writing effectiveness and mechanics. That is why CLA+ focuses on these skills and why CAE believes employers should use this tool during recruitment efforts.

Two important questions:

1) Are the CLA+ and related assessments measuring something other than the general cognitive ability of individuals who have had many years (K-12 plus at least some college) of education?

2) By how much does a college education improve CLA+ scores?

The study below, which involved 13 colleges (ranging from MIT, Michigan, Minnesota, to Cal-State Northridge, Alabama A&M, ...) gives some hints at answers.
Test Validity Study (TVS) Report

This study examined whether commonly used measures of college-level general educational outcomes provide comparable information about student learning. Specifically, do the students and schools earning high scores on one such test also tend to earn high scores on other tests designed to assess the same or different skills? And, are the strengths of these relationships related to the particular tests used, the skills (or “constructs”) these tests are designed to measure (e.g., critical thinking, mathematics, or writing), the format they use to assess these skills (multiple-choice or constructed-response), or the tests’ publishers? We also investigated whether the difference in mean scores between freshmen and seniors was larger on some tests than on others. Finally, we estimated the reliability of the school mean scores on each measure to assess the confidence that can be placed in the test results.

Effect sizes are modest. The result "d+" in the table below is the average increase in score between freshmen and seniors tested, in units of standard deviations. An individual's score as a freshman is probably a very good predictor of their score as a senior. (To put it crudely, additional years of expensive post-secondary education do not increase cognitive ability by very much. What cognitive tests measure is fairly stable, despite the efforts of educators.)

Note, in order to correct for the problem that weaker students drop out between freshman and senior years, and hence the senior population is academically stronger, the researchers adjusted effect sizes. The adjustment used was simply the average SAT score difference (in SD units) between seniors and freshmen in each school's sample (students who survive to senior year tend to have higher SAT scores -- go figure!). In other words, to get their final results, the researchers implicitly acknowledged that these new tests are largely measuring the same general cognitive abilities as the SAT!

Below are school-level correlations and reliabilities on various assessments, which show that cognitive constructs ("critical thinking", "mathematics", etc.) are consistently evaluated regardless of specific test used. Hint: ACT, SAT, GRE, PISA, etc. would have worked just as well ...

The results below are also good evidence for a school-level general factor of ability = "G". The researchers don't release specific numbers, but I'd guess MIT has a much higher G than some of the lower ranked schools, and that the value of G can be deduced just from average SAT score of the school.

Does the CLA have validity in predicting job and life outcomes? Again, experienced psychometricians know the answer, but stay tuned as data gradually accumulate.
Documenting Uncertain Times: Post-graduate Transitions of the Academically Adrift Cohort

Graduates who scored in the bottom quintile of the CLA were three times more likely to be unemployed than those who scored in the top quintile on the CLA (9.6 percent compared to 3.1 percent), twice as likely to be living at home (35 percent compared to 18 percent) and significantly more likely to have amassed credit card debt (51 percent compared to 37 percent).

Tuesday, January 13, 2015

Analogies between Analogies

As reported by Stan Ulam in Adventures of a Mathematician:
"A mathematician is a person who can find analogies between theorems; a better mathematician is one who can see analogies between proofs and the best mathematician can notice analogies between theories. One can imagine that the ultimate mathematician is one who can see analogies between analogies."  --Stefan Banach
See also Analogies between Analogies: The Mathematical Reports of S.M. Ulam and His Los Alamos Collaborators; esp. article 20 On the Notion of Analogy and Complexity in Some Constructive Mathematical Schemata.

I'll add my own comment:
The central problem of modern genomics is essentially cryptographic. The encryption scheme is the model relating phenotype to genotype, and the ciphertext--plaintext pairs are the genotypes and phenotypes. We will recover the schemes -- models which can predict phenotype from genotype -- once enough ciphertext and plaintext (data) is available for analysis.

We have programs (DNA code) and their outputs (organisms) to study; from this we deduce the programming language.
See also Alan Turing:
“There is a remarkably close parallel between the problems of the physicist and those of the cryptographer. The system on which a message is enciphered corresponds to the laws of the universe, the intercepted messages to the evidence available, the keys for a day or a message to important constants which have to be determined. The correspondence is very close, but the subject matter of cryptography is very easily dealt with by discrete machinery, physics not so easily.”

Locality and Nonlinear Quantum Mechanics v2

The paper below will appear in Int.J.Mod.Phys.A. We went through a strange series of referees during the last year, with reactions ranging from

this result is correct but trivial 


this result is highly nontrivial but possibly correct

to, finally,

this is a nice result and should be published. 

I would like to lock the first two referees in a room to exchange ideas! (What!? Of course, HE is the idiot, not ME!)

A consequence of the process is the added appendix which proves (rather pedantically)

Ψ[ φ ]  ≈  ψ_A [ φ_A ]  ×  ψ_B [ φ_B ]  ×  · · ·

for our coherent state example.
Locality and Nonlinear Quantum Mechanics

Chiu Man Ho, Stephen D.H. Hsu

Nonlinear modifications of quantum mechanics generically lead to nonlocal effects which violate relativistic causality. We study these effects using the functional Schrodinger equation for quantum fields and identify a type of nonlocality which causes nearly instantaneous entanglement of spacelike separated systems. We describe a simple example involving widely separated wave-packet (coherent) states, showing that nonlinearity in the Schrodinger evolution causes spacelike entanglement, even in free field theory.
Some excerpts:
The linear structure of quantum mechanics has deep and important consequences, such as the behavior of superpositions. One is naturally led to ask whether this linearity is fundamental, or merely an approximation: Are there nonlinear terms in the Schrodinger equation?

Nonlinear quantum mechanics has been explored in [1–6]. It has been observed that the fictitious violation of locality in the Einstein-Podolsky-Rosen (EPR) experiment in conventional linear quantum mechanics might become a true violation due to nonlinear effects [7, 8] (in [8] signaling between Everett branches is also discussed). This might allow superluminal communication and violate relativistic causality. These issues have subsequently been widely discussed [9].

Properties such as locality or causality are difficult to define in non-relativistic quantum mechanics (which often includes, for example, “instantaneous” potentials such as the Coulomb potential). Therefore, it is natural to adopt the framework of quantum field theory: Lorentz invariant quantum field theories are known to describe local physics with relativistic causality (influences propagate only within the light cone), making violations of these properties easier to identify. ...

... Our results suggest that nonlinearity in quantum mechanics is associated with violation of relativistic causality. We gave a formulation in terms of factorized (unentangled) wavefunctions describing spacelike separated systems. Nonlinearity seems to create almost instantaneous entanglement of the two systems, no matter how far apart. Perhaps our results are related to what Weinberg [11] meant when he wrote “... I could not find any way to extend the nonlinear version of quantum mechanics to theories based on Einstein’s special theory of relativity ... At least for the present I have given up on the problem: I simply do not know how to change quantum mechanics by a small amount without wrecking it altogether.”
See also Wrong, Trivial, Not Original.

Boom, Bust, and the Global Race for Scientific Talent

Michael Tietelbaum's new book on STEM labor markets and human capital is reviewed by John McGowan. John and I attended Caltech together many years ago.
Falling Behind? Boom, Bust, and the Global Race for Scientific Talent
by Michael S. Teitelbaum
Princeton University Press
March 30, 2014


Falling Behind? is a recent (March 2014) book by Michael Teitelbaum of the Sloan Foundation, a demographer and long time critic of STEM (Science, Technology, Engineering and Mathematics) shortage claims. Falling Behind? is an excellent book with a wealth of data and information on the history of booms and busts in science and engineering employment since World War II, STEM shortage claims in general, and lobbying for “high-skilled” immigration “reform”. Although I have been a student of these issues for many years, I encountered many facts and insights that I did not know or had not thought of. Nonetheless the book has a number of weakenesses which readers should keep in mind.

... The evidence assembled in this book leads inescapably to three core findings:

o First, that the alarms about widespread shortages or shortfalls in the number of U.S. scientists and engineers are quite inconsistent with nearly all available evidence;

o Second, that similar claims of the past were politically successful but resulted in a series of booms and busts that did harm to the U.S. science and engineering enterprise and made careers in these fields increasingly unattractive; and

o Third, that the clear signs of malaise in the U.S. science and engineering workforce are structural in origin and cannot be cured simply by providing additional funding. To the contrary, recent efforts of this kind have proved to be destabilizing, and advocates should be careful what they wish for. ...
See also A Tale of Two Geeks.

Monday, January 05, 2015

Instability of Quantum de Sitter Spacetime

New paper! We show that quantum effects (in particular, the horizon temperature originally discovered by Gibbons and Hawking) modify the geometry of de Sitter spacetime.
Instability of Quantum de Sitter Spacetime (

Chiu Man Ho, Stephen D. H. Hsu

Quantized fields (e.g., the graviton itself) in de Sitter (dS) spacetime lead to particle production: specifically, we consider a thermal spectrum resulting from the dS (horizon) temperature. The energy required to excite these particles reduces slightly the rate of expansion and eventually modifies the semiclassical spacetime geometry. The resulting manifold no longer has constant curvature nor time reversal invariance, and back-reaction renders the classical dS background unstable to perturbations. In the case of AdS, there exists a global static vacuum state; in this state there is no particle production and the analogous instability does not arise.

Zero Sum: college costs and public support of higher education

College tuition has increased faster than the rate of inflation for some time now. But the issue is more complicated than this simple observation suggests.

1. The increase in tuition cost at public institutions is mainly due to cuts in state support (see figure below), as opposed to enlargement of the overall budget.

2. The average amount paid per student is typically less than full tuition, due to financial aid. Redistribution is taking place, from families that can afford the full rate, to those that need assistance. The year to year rate of increase in the average tuition paid has typically been less than the increase in full tuition per student ("sticker price").

Below are the specific numbers for Michigan State University -- full tuition in 2012 for Michigan residents was ~ $12k.

Here's more data (thanks to Dave Bacon) supporting my claim for public institutions of higher learning: total expenditures roughly constant, tuition changes related to internal cost shifting. Note, though, that private research universities are an exception: they've been raising both tuition and expenditures in recent decades.

Sunday, January 04, 2015

Fukuyama and Zhang on the China Model

This is an interesting discussion between Francis Fukuyama and Zhang Wei Wei on the so-called China Model. Zhang is an apologist but overall the discussion is enlightening. Fukuyama's perspective is the familiar liberal democratic one so I excerpt Zhang below.
ZHANG | ... In his presentation, Dr. Fukuyama raised four issues concerning the China Model, namely, accountability, rule of law, the “bad emperor” and sustainability. I would like to respond to Dr. Fukuyama’s view. I think what China has been doing is very interesting. China is now perhaps the world’s largest laboratory of political, economic, social and legal reforms in the world. What Dr. Fukuyama said reminds me of my conversation with the editor-in-chief of the German magazine Die Zeit last February. The topic was also the China Model. After a recent visit to Shanghai, he felt that there were more and more similarities between Shanghai and New York. In his eyes, China seems to follow the US model. “Does it mean there is no China Model but only the US model?” he asked. I counseled him to look at Shanghai more carefully and know the city well. A careful observer will find that Shanghai has overtaken New York in many respects.

Shanghai outperforms New York in terms of “hardware” such as high-speed trains, subways, airports, harbors and many commercial facilities, but also in terms of “software.” For instance, life expectancy in Shanghai is three to four years longer than New York, and the infant mortality rate in Shanghai is lower than New York. Shanghai is a much safer place where girls can stroll the streets at midnight. My message to this German scholar is that we’ve learned a lot from the West; we’re still learning from the West, and will continue to do so in the future, but it’s also true that we have indeed looked beyond the Western model or the US model. To a certain extent, we are exploring the political, economic, social and legal systems of the next generation. In this process, the more developed regions of China like Shanghai are taking the lead. ...

... I have visited the US on many occasions and found that the definition of corruption matters a lot. In my new book, I put forward a concept of “corruption 2.0,” as the financial crisis has exposed many serious “corruption 2.0” issues. For instance, rating agencies gain profits through regulatory arbitrage by granting triple A’s to dubious financial products or institutions. I think this is corruption. But these issues are called “moral hazards” in the American legal system. I think the financial crisis can be better tackled if these problems are treated as corruption.

We can also make horizontal comparisons. I have visited more than one hundred countries. The reality is that no matter how much Chinese complain about corruption at home, it is much worse in other nations of comparable size, say, those with a population of 50 million and above, and at similar stage of development such as India, Ukraine, Pakistan, Brazil, Egypt and Russia. The evaluation of Transparency International echoes my view.

Furthermore, it’s necessary to look at such a large country as China in terms of regions. China’s developed regions are more immune to corruption. I once stayed in Italy as a visiting professor and visited Greece several times, and I think Shanghai is definitely less corrupt than Italy and Greece. ... Indeed, whatever political system, be it a one party system, a multi-party system, or a no party system, it must all boil down to good governance and what you can deliver to your people. Therefore, good governance matters most, rather than western-style democratization.

This brings me to Prof. Fukuyama’s “end of history” thesis. I have not published my point of view yet. But mine is exactly the opposite to Prof. Fukuyama’s. I take the view that it is not the end of history, but the end of the end of history.

The Western democratic system might be only transitory in the long history of mankind. Why do I think so? Two thousand and five hundred years ago, some Greek city states like Athens, practiced democracy among its male citizens and later were defeated by Sparta. From then on, for over two thousand years, the word “democracy” basically carried the negative connotation, often equivalent to “mob politics.” ...

But today, this kind of democratic system cannot solve the following big problems. First, there is no culture of “talent first.” Anyone who is elected can rule the country. This has become too costly and unaffordable even for a country like the US. Second, the welfare package can only go up, not down. Therefore it is impossible to launch such reforms as China did in its banking sector and state-owned enterprises. Thirdly, it is getting harder and harder to build social consensus within democratic countries. In the past, the winning party with 51% of votes could unite the whole society in the developed countries. Today American society is deeply divided and polarized. The losing party, instead of conceding defeat, continues to obstruct. Fourth, there is an issue of simple-minded populism which means that little consideration can be given to the long-term interest of a nation and society. Even countries like the US are running this risk.

In 1793, King George III of the UK sent his envoy to China to open bilateral trade. But Emperor Qianlong was so arrogant that he believed that China was the best country in the world. Therefore China did not need to learn anything from others. This is what defined the “end of history” then, and ever since China lagged behind. Now I observe a similar mindset in the West.

It is necessary to come to China and see with one’s own eyes how China has reformed itself over the past three decades. Small is each step, yet the journey is non-stop. The West still has strong faith in its own system, but it is the same system that has become more and more problematic. Greece, the cradle of Western democracy, has gone bankrupt. The British fiscal debt is as high as 90% of its GDP.

What about the US? I did a simple calculation. The 9/11 attack cost the US about $1 trillion, the two not-so-smart wars cost US about $3 trillion and the financial crisis about $8 trillion. Now the fiscal debts of the US are somewhere between $10 to 20 trillion. In other words, if the US dollar was not the main international reserve currency—this status may not last forever—the US would be bankrupt already. ...
See also Zhang's NYTimes editorial Meritocracy Versus Democracy.
... Virtually all the candidates for the Standing Committee of the Party, China’s highest decision-making body, have served at least twice as a party secretary of a Chinese province or at similar managerial positions. It takes extraordinary talent and skills to govern a typical Chinese province, which is on average the size of four to five European states.

Indeed, with the Chinese system of meritocracy in place, it is inconceivable that people as weak and incompetent as George W. Bush or Yoshihiko Noda of Japan could ever get to the top leadership position.

Take the incoming leader, Xi Jinping, as an example. Xi served as the governor of Fujian Province, a region known for its dynamic economy, and as party secretary of Zhejiang province, which is renowned for its thriving private sector, and Shanghai, China’s financial and business hub with a powerful state-sector.

In other words, prior to taking his current position as the heir apparent to President Hu Jintao, Xi had in fact managed areas with total population of over 120 million and an economy larger than India’s. He was then given another five years to serve as vice president to get familiar with running state and military affairs at the national level.

China’s meritocracy challenges the stereotypical dichotomy of democracy v. autocracy. From Beijing’s point of view, the nature of a state, including its legitimacy, has to be defined by its substance: good governance, competent leadership and success in satisfying the citizenry. ...
Related posts: Is there a China Model? , China 3.0 and China 1793.

Tuesday, December 30, 2014

Measuring missing heritability: Inferring the contribution of common variants

This recent paper from Eric Lander proposes an alternative to GCTA. There is an interesting change in tone vis a vis an earlier paper with Zuk. Instead of speculating about explanations of missing heritability (beyond the existence of yet undiscovered common variants of small effect), the paper focuses on the claim that REML/GCTA underestimates the heritability due to common variants in case-control designs. The proposed alternative methodology, called phenotype correlation–genetic correlation (PCGC) regression, estimates heritability by directly regressing phenotype correlation vs genotype correlation across all pairs in the sample. (This is how I usually explain the concept behind GCTA when I don't want to get into details of REML, LMMs, etc.)

Personally, I am not especially concerned about the precise value of heritability estimates from REML/GCTA or PCGC, as there are significant uncertainties that go beyond the simple additive model assumed in both of these methods (e.g., due to nonlinear genetic architecture). For me it is sufficient that the results of both are consistent with classical estimates from twin and adoption studies, and yield h2 ~ 0.5 or higher for many interesting traits.
Measuring missing heritability: Inferring the contribution of common variants (PNAS)

D. Golan, E. Lander and S. Gosset

Studies have identified thousands of common genetic variants associated with hundreds of diseases. Yet, these common variants typically account for a minority of the heritability, a problem known as “missing heritability.” Geneticists recently proposed indirect methods for estimating the total heritability attributable to common variants, including those whose effects are too small to allow identification in current studies. Here, we show that these methods seriously underestimate the true heritability when applied to case–control studies of disease. We describe a method that provides unbiased estimates. Applying it to six diseases, we estimate that common variants explain an average of 60% of the heritability for these diseases. The framework also may be applied to case–control studies, extreme-phenotype studies, and other settings.
From the conclusion:
... Our results suggest that larger CVASs [GWAS] will identify many additional common variants related to common diseases, although many additional common variants likely still will have effect sizes that fall below the limits of detection given practically achievable sample sizes. Still, common variants clearly will not explain all heritability. As discussed in the first two papers in this series (2,3), rare genetic variants and genetic interactions likely will make important contributions as well. Fortunately, advances in DNA sequencing technology should make it possible in the coming years to carry out comprehensive studies of both common and rare genetic variants in tens (and possibly hundreds) of thousands of cases and controls, resulting in a fuller picture of the genetic architecture of common diseases.
Hopefully, more papers like this one will help the field of genomics to update its priors: the most reasonable hypothesis concerning "missing heritability" is simply that larger sample size is required to find the many remaining alleles of small effect. Fisher's infinitesimal model will turn out to be a good first approximation for most human traits. See also Additivity and complex traits in mice.

Sunday, December 28, 2014

Power and paranoia in Silicon Valley

Plenty of fear and loathing of the nerd rapture backed by powerful VCs in this Harper's article. Ungated version.

Discussed in depth at LessWrong.
... Be explorers; take advantage of this vast new landscape that’s been opened up to us in this time and this place; and bear the torch of applied rationality like brave explorers. And then, like, keep in touch by email.” The workshop attendees put giant Post-its on the walls expressing the lessons they hoped to take with them. A blue one read RATIONALITY IS SYSTEMATIZED WINNING. Above it, in pink: THERE ARE OTHER PEOPLE WHO THINK LIKE ME. I AM NOT ALONE.

... I talked to one of my roommates, a Google scientist who worked on neural nets. The CFAR workshop [[ Center For Applied Rationality ]] was just a whim to him, a tourist weekend. “They’re the nicest people you’d ever meet,” he said, but then he qualified the compliment. “Look around. If they were effective, rational people, would they be here? Something a little weird, no?”

... Were they really going to save the world? From what? “Imagine there is a set of skills,” he said. “There is a myth that they are possessed by the whole population, and there is a cynical myth that they’re possessed by 10% of the population. They’ve actually been wiped out in all but about one person in three thousand.” It is important, Vassar said, that his people, “the fragments of the world,” lead the way during “the fairly predictable, fairly total cultural transition that will predictably take place between 2020 and 2035 or so.” We pulled up outside the Rose Garden Inn. He continued: “You have these weird phenomena like Occupy where people are protesting with no goals, no theory of how the world is, around which they can structure a protest. Basically this incredibly, weirdly, thoroughly disempowered group of people will have to inherit the power of the world anyway, because sooner or later everyone older is going to be too old and too technologically obsolete and too bankrupt. The old institutions may largely break down or they may be handed over, but either way they can’t just freeze. These people are going to be in charge, and it would be helpful if they, as they come into their own, crystallize an identity that contains certain cultural strengths like argument and reason.” I didn’t argue with him, except to press, gently, on his particular form of elitism. His rationalism seemed so limited to me, so incomplete. “It is unfortunate,” he said, “that we are in a situation where our cultural heritage is possessed only by people who are extremely unappealing to most of the population.” That hadn’t been what I’d meant. I had meant rationalism as itself a failure of the imagination. “The current ecosystem is so totally fucked up,” Vassar said. “But if you have conversations here” -- he gestured at the hotel -- “people change their mind and learn and update and change their behaviors in response to the things they say and learn. That never happens anywhere else.” ...
Makes me wish I still lived in the Bay Area :-)  My MIRI interview.

Howard French: China's Second Continent

Another recommendation: China's Second Continent: How a Million Migrants Are Building a New Empire in Africa by Howard French (a former Africa and China correspondent for the NY Times). This is real boots on the ground reporting. French (a Mandarin speaker) spent time with Chinese immigrants across Africa, from small shopkeepers and farmers to real estate moguls and high government officials. Reviews: WSJ, NYTimes.

An interview with French on the Sinica podcast.
Exactly how exploitative are Chinese development activities on the African continent? What exactly is motivating the various resources-for-development deals inked by African governments over the last decade, and what strategies are these governments now adopting in the face of power imbalances with China? What is driving the mass migration of Chinese workers to the African continent, and why does everyone from Senegal seem to come from Henan?

This week on Sinica, we ask these questions and many more as Kaiser Kuo and Jeremy Goldkorn are joined in conversation with Howard French. If you've spent a while in China, you may have heard of Howard as the author of a well-known book on Shanghai's architectural legacy, and lecturer on the subject. What you may not know is that he is also an expert on African development, and the new author of China's Second Continent: How a Million Migrants Are Building a New Empire in Africa.

I wonder whether French is familiar with Galton's famous (and very politically incorrect; written in 1873) letter Africa for the Chinese. In some respects Galton is eerily prescient.
... The Chinaman is a being of another kind, who is endowed with a remarkable aptitude for a high material civilization. He is seen to the least advantage in his own country, where a temporary dark age still prevails, which has not sapped the genius of the race, though it has stunted the development of each member of it, by the rigid enforcement of an effete system of classical education which treats originality as a social crime. All the bad parts of his character, as his lying and servility, spring from timidity due to an education that has cowed him, and no treatment is better calculated to remedy that evil than location in a free settlement. The natural capacity of the Chinaman shows itself by the success with which, notwithstanding his timidity, he competes with strangers, wherever he may reside. The Chinese emigrants possess an extraordinary instinct for political and social organization; they contrive to establish for themselves a police and internal government, and they give no trouble to their rulers so long as they are left to manage those matters by themselves. They are good-tempered, frugal, industrious, saving, commercially inclined, and extraordinarily prolific. They thrive in all countries, the natives of the Southern provinces being perfectly able to labor and multiply in the hottest climates. ...

... The pressure of population in China is enormous, and its outflow is great and increasing. There is no lack of material for a suitable immigration into Africa. ... The Chinese have a land hunger, as well as a love for petty traffic, and they would find a field in which to gratify both of these tastes on the East African Coast. There are many Chinese capitalists resident in foreign parts who might speculate in such a system and warmly encourage it. ...

Belonging and Genocide: Hitler's Community, 1918-1945

I recommend this podcast interview with Thomas Kuhne, author of Belonging and Genocide: Hitler's Community, 1918-1945.

Kuhne claims that no German soldier ever faced court martial for refusing to kill a civilian. He estimates that (only?) about 200k German soldiers in total were involved in the killing of Jews or other civilians. But by the end of the war every German who wanted to know about "crimes in the east" could easily find out. This last observation is supported by letters and diary entries of ordinary people. Matters of national guilt or conscience weighed heavily on soldiers and ordinary Germans by the end of the war, Kuhne claims.

Kuhne makes interesting observations about the male social hierarchy within military units. Those who refused to carry out Nazi orders against civilians were regarded as weaklings, but were not subjected to direct reprisal.
There are two means to unite a people — common ideals and common crime.
—Adolf Hitler, Party Leader, Munich, 1923

If this Jewish business is ever avenged on earth, then have mercy on us Germans.
—Major Trapp, Police Officer, Poland, 1942

For there is a great, bright aspect to this war: namely a great comradeship.
—Adolf Hitler, Reich Chancellor, Berlin, 1942

We Germans are the nation that has gone for this war enthusiastically and will have to bear the consequences.
—Franz Wieschenberg, Wehrmacht Private, Eastern Front, 1944

To stick together and to fight side by side and be wounded side by side, that’s our wish.
—Kurt Kreissler, Wehrmacht NCO, Germany, 1945

UFC 182: Jones vs Cormier

This will be one for the ages. I think Cormier can get inside on the taller Jones. We'll see Jones fighting off his back for the first time. I wonder what his guard is like.

In the last video Cormier is shown wrestling with Russian Olympic gold medalist Khajumurad Gatsalov.

Wednesday, December 24, 2014

Peace on Earth, Good Will to Men 2014

For years, when asked what I wanted for Christmas, I've been replying: peace on earth, good will toward men :-)

No one ever seems to recognize that this comes from the bible, Luke 2.14 to be precise!

Linus said it best in A Charlie Brown Christmas:
And there were in the same country shepherds abiding in the field, keeping watch over their flock by night.

And, lo, the angel of the Lord came upon them, and the glory of the Lord shone round about them: and they were sore afraid.

And the angel said unto them, Fear not: for, behold, I bring you good tidings of great joy, which shall be to all people.

For unto you is born this day in the city of David a Saviour, which is Christ the Lord.

And this shall be a sign unto you; Ye shall find the babe wrapped in swaddling clothes, lying in a manger.

And suddenly there was with the angel a multitude of the heavenly host praising God, and saying,

Glory to God in the highest, and on earth peace, good will toward men.

Merry Christmas!
In preparation for the new year:
Marcus Aurelius

Or does the bubble reputation distract you? Keep before your eyes the swift onset of oblivion, and the abysses of eternity before us and behind; mark how hollow are the echoes of applause, how fickle and undiscerning the judgments of professed admirers, and how puny the arena of human fame. For the entire earth is but a point, and the place of our own habitation but a minute corner in it; and how many are therein who will praise you, and what sort of men are they?

Tuesday, December 23, 2014

Gender trouble in the valley

This NYTimes article looks at the gender disparity in technology career success within the Stanford class of 1994.
NYTimes: In the history of American higher education, it is hard to top the luck and timing of the Stanford class of 1994, whose members arrived on campus barely aware of what an email was, and yet grew up to help teach the rest of the planet to shop, send money, find love and navigate an ever-expanding online universe. ...
I found this reader comment to be realistic -- it is consistent with my own experience both as a parent and as a startup founder.
tiddle nyc

I've been in tech field for some years now. Being a working mother, with two kids (one boy, one girl), this subject hits close to home.

When I first started, there were more women in the ranks than it is now. I never experienced any sexism or discrimination in workplace, nor did I ever feel pushed aside. But I have to say this to my fellow female peers, in order to get ahead, you have to stay in the field. Dropping out or even scaling back will not help, and you can't blame others for not entrusting you with high profile projects because you might not be here next week.

Naturally it helps to have a spouse who share chores and childrearing, rather than having the woman/mother/wife to have-it-all, but really do-it-all which is practically impossible. That's how we stay the course and allow a pathway for younger generations of female to move up the ranks.

Looking at my kids - and we raise them to have the same aspirations, ambitions, and aggressiveness - there is indeed certain nature-vs-nurture difference. Justified or not, my son is almost always over-confident in his ability in all situations whereas my daughter is more circumspect and tentative (even if she's more than capable). It takes a lot more encouragement to prompt my daughter to be aggressive, whereas my son naturally does it on his own. As I look around all those in fields like VC and startups, I see mirrors of how men and women behavior.

This article doesn't surprise me.
See also Gender differences in preferences, choices, and outcomes: SMPY longitudinal study. A longitudinal study of mathematically precocious men and women (SMPY) showed significant gender differences in life and career preferences:
... According to the results, SMPY men are more concerned with money, prestige, success, creating or inventing something with impact, etc. SMPY women prefer time and work flexibility, want to give back to the community, and are less comfortable advocating unpopular ideas. Some of these asymmetries are at the 0.5 SD level or greater. Here are three survey items with a ~ 0.4 SD or more asymmetry:

# Society should invest in my ideas because they are more important than those of other people.

# Discomforting others does not deter me from stating the facts.

# Receiving criticism from others does not inhibit me from expressing my thoughts.

I would guess that Silicon Valley entrepreneurs and leading technologists are typically about +2 SD on each of these items! One can directly estimate M/F ratios from these parameters ...

The anecdote below about serial entrepreneur David Sacks is amusing:
NYTimes: ... Mr. Sacks almost wasn't hired because of doubts that he could work well with others; during his job interview, he put the chief financial officer on notice that his own job would be totally different once Mr. Sacks arrived, Mr. Thiel remembered. But his lack of social grace became an asset, according to Mr. Thiel and other former colleagues. He did not waste time on meetings that seemed pointless, and he bluntly insisted that the engineers whittle an eight-page PayPal registration process down to one.

Everyone knew Mr. Sacks was politically conservative, but in the office, he was less bombastic. He had become a manager, he said in an interview, and did not want to hurt the cohesion of his team. But he and Mr. Thiel now had a setting in which to try out their ideas about diversity and meritocracy. 'In the start-up crucible, performing is all that matters,' Mr. Sacks wrote about that time. He wanted to give all job applicants tests of cognitive ability, according to his colleague Keith Rabois, and when the company searched for a new chief executive, one of the requirements was an I.Q. of 160 -- genius level.

The goal was 'pure meritocracy,' said Amy Klement, one of a small number of women to rise high within the organization. She and other women called Mr. Sacks an effective, relentless, generous boss. But some also wondered how comfortable the men running the company were around them. Lauri Schultheis said that when she interviewed to be PayPal's office manager, and its first female employee -- before even Mr. Sacks arrived -- an engineer asked her, 'Does this mean I have to stop looking at porn? ...

Monday, December 22, 2014

Quantum GDP

"It's been only half jokingly said that today a third of GDP is attributable to quantum mechanics," -- former Lockheed CEO Norm Augustine.
I've heard the one third or 30% of GDP figure from time to time, but have never seen a detailed analysis. A list of modern technologies that arose from quantum mechanics would include: transistors, microprocessors, lasers, sophisticated chemistry and materials science, nuclear energy, memory chips, hard drive storage, LEDs, LCD displays, etc. These certainly account for a significant fraction of GDP.

Estimates of expenditures on communications and information technology alone in developed countries are typically in the 5-10% GDP range, which provides a lower bound. While the actual figure may be less than 30% it is certainly substantial. See here for a history of physics contributions to information technologies.

The huge (but poorly understood) impact of quantum mechanics on modern life is an example of the tremendous long term impact of fundamental research. There is every reason to think that increased world research expenditures would enhance productivity and quality of life, with very high ROI. However, there is little careful thinking about the "right" level of research investment as a fraction of GDP. Instead, we get:

Perhaps the most amazing aspect of the history of quantum mechanics is not its technological and practical impact, but rather how it led to deep changes in how we think about the universe. See, e.g., Two slit experimentBell and GHZWeinberg on quantum foundations, and On the origin of probability in quantum mechanics.

Early pioneers doubted whether humans were smart enough to understand quantum physics:
[Wigner] Until 1925, most great physicists, including Einstein and Planck, had doubted that man could truly grasp the deepest implications of quantum theory. They really felt that man might be too stupid to properly describe quantum phenomena. ... the men at the weekly colloquium in Berlin wondered "Is the human mind gifted enough to extend physics into the microscopic domain ...?" Many of those great men doubted that it could.
Quantum mechanics, which made possible the modern age, is nevertheless only understood by at most a fraction of a percent of the population. See also Psychometric thresholds for physics and mathematics, Chomsky: genetic barriers to scientific progress, and Beyond Human Science.
Beyond Human Science: [This Ted Chiang short story envisions a future in which science has become the province of genetically enhanced "metahumans" -- leaving non-enhanced humans to gape from the sidelines.]

... imagine if research offered hope of a different intelligence-enhancing therapy, one that would allow individuals to gradually "up-grade" their minds to a metahuman-equivalent level. Such a therapy would offer a bridge across what has become the greatest cultural divide in our species' history ...

We need not be intimidated by the accomplishments of metahuman science. We should always remember that the technologies that made metahumans possible were originally invented by humans, and they were no smarter than we.

Saturday, December 13, 2014

Preimplantation genetic diagnosis and screening using next generation sequencing

This BGI study reports pre-implantation sequencing of hundreds of blastocysts. 42 ongoing pregnancies were achieved, with 24 babies born thus far.
Clinical outcome of preimplantation genetic diagnosis and screening using next generation sequencing

Next generation sequencing (NGS) is now being used for detecting chromosomal abnormalities in blastocyst trophectoderm (TE) cells from in vitro fertilized embryos. However, few data are available regarding the clinical outcome, which provides vital reference for further application of the methodology. Here, we present a clinical evaluation of NGS-based preimplantation genetic diagnosis/screening (PGD/PGS) compared with single nucleotide polymorphism (SNP) array-based PGD/PGS as a control.

A total of 395 couples participated. They were carriers of either translocation or inversion mutations, or were patients with recurrent miscarriage and/or advanced maternal age. A total of 1,512 blastocysts were biopsied on D5 after fertilization, with 1,058 blastocysts set aside for SNP array testing and 454 blastocysts for NGS testing. In the NGS cycles group, the implantation, clinical pregnancy and miscarriage rates were 52.6% (60/114), 61.3% (49/80) and 14.3% (7/49), respectively. In the SNP array cycles group, the implantation, clinical pregnancy and miscarriage rates were 47.6% (139/292), 56.7% (115/203) and 14.8% (17/115), respectively. The outcome measures of both the NGS and SNP array cycles were the same with insignificant differences. There were 150 blastocysts that underwent both NGS and SNP array analysis, of which seven blastocysts were found with inconsistent signals. All other signals obtained from NGS analysis were confirmed to be accurate by validation with qPCR. The relative copy number of mitochondrial DNA (mtDNA) for each blastocyst that underwent NGS testing was evaluated, and a significant difference was found between the copy number of mtDNA for the euploid and the chromosomally abnormal blastocysts. So far, out of 42 ongoing pregnancies, 24 babies were born in NGS cycles; all of these babies are healthy and free of any developmental problems.

This study provides the first evaluation of the clinical outcomes of NGS-based pre-implantation genetic diagnosis/screening, and shows the reliability of this method in a clinical and array-based laboratory setting. NGS provides an accurate approach to detect embryonic imbalanced segmental rearrangements, to avoid the potential risks of false signals from SNP array in this study.


For those that can read Chinese, the journal Remembrance is archived here.

My father intended to take a sabbatical at Tsinghua University in Beijing when I was in grade school, but reconsidered it because of the craziness of the Cultural Revolution. I recall going with my mom and brother to get a passport photo taken in downtown Ames. Instead, we ended up at the University of Chicago, where my dad worked with another fluid dynamicist interested in vortices and tornadoes. My brother and I knew nothing about the Cultural Revolution, despite my dad's occasional comments. But we did realize we weren't in Iowa anymore when we saw the half dozen locks and iron bar on the door of our Hyde Park apartment in Chicago.
NY Review of Books: ... Besides Remembrance, China has roughly half a dozen other samizdat publications that explore the past through accounts of personal experience, including Scars of the Past (Wangshi Weihen), Annals of the Red Crag (Hongyan Chunqiu), and Yesterday (Zuotian). In addition, there are a growing number of underground documentary films, including some that send students to collect oral histories in villages that suffered during the Great Leap Famine or the Cultural Revolution.

One Saturday this spring, several of Remembrance’s regular writers stopped by the Tiantongyuan apartment for a pot of Pu’er tea and a chat with the journal’s cofounder, the retired film historian Wu Di. As they arrived, Wu leaned back in his chair and gave a running commentary on each. Among them were a computer data specialist at a technical university (“the greatest specialist on Lin Biao!”), an editor of the Communist Party’s flagship newspaper People’s Daily (“obviously he has to keep a low profile”), and a befuddled professor who had to call Wu three times to get directions (“what an egghead—he knows everything about violence in the Cultural Revolution but doesn’t know how to hail a gypsy cab”).

... Yet the memories of his youth stayed with him. He knew he had witnessed history and spent the 1980s carefully writing down what he’d heard, corroborating information with eyewitnesses. A fresh finding was the degree of ethnic hatred that underlay the violence. Official figures show that during the Cultural Revolution in Inner Mongolia 22,900 died and 790,000 were imprisoned, but there was no atonement and no discussion of the fact that most of the killers were Chinese or that the victims overwhelmingly were Mongolians. Wu’s conclusion was that this unresolved era continues to underlie ethnic tensions in the region.

But the manuscript was unpublishable and there was no Remembrance to get even the gist of it published in China. It lay in Wu’s desk drawer, a fading memory of the windswept Mongolian steppes. ...

... According to arcane rules that everyone accepts but whose origins no one knows, China’s public security classifies e-mails to fewer than two hundred people as a private distribution list; anything more is a publication, which means censorship and oversight. So officially, Remembrance’s writers are just people interested in history sending out an e-mail every once in a while to interested friends. It’s not their fault if Remembrance somehow reaches many of China’s educated elite, and is avidly read and collected by researchers abroad. Forwarding is beyond Wu’s control.

Outside, we could hear the men arguing. Their voices rose, until the discussion sounded almost angry; one man seemed to be shouting. The topic was the apologies made to victims of the Cultural Revolution, which had caused much debate in China’s social media in 2013 and 2014. The group could not agree whether it was a good thing or not. I prepared to go over and listen in. Dai looked up.

“They get heated, but it’s a chance for a release. They teach at universities but can’t teach this to their students. Think about that.”

Sunday, December 07, 2014

Feynman Lectures: Epilogue

The full text of The Feynman Lectures is now available online. These lectures were originally delivered to satisfy the physics requirement for first and second year students at Caltech. Legend has it that as the lectures went on, fewer and fewer undergraduates were seen in attendance, with their places taken by graduate students and even members of the faculty! In his epilogue, Feynman notes that only a few dozen students (out of a Caltech cohort of perhaps 200) were able to fully appreciate the material as it was delivered. Nevertheless, the lectures have been a resource for the physics community ever since.

When I was a high school student I took advanced physics courses at the local university. One of my professors suggested I look at the Feynman lectures for more challenging material. I ordered a set (paperback, with red covers) through the university bookstore -- I think they cost $30 in 1982. Years later I obtained a commemorative hardcover set (blue) which sits on my shelf even now.
Feynman's Epilogue

Well, I've been talking to you for two years and now I'm going to quit. In some ways I would like to apologize, and other ways not. I hope — in fact, I know — that two or three dozen of you have been able to follow everything with great excitement, and have had a good time with it. But I also know that “the powers of instruction are of very little efficacy except in those happy circumstances in which they are practically superfluous.” So, for the two or three dozen who have understood everything, may I say I have done nothing but shown you the things. For the others, if I have made you hate the subject, I'm sorry. I never taught elementary physics before, and I apologize. I just hope that I haven't caused a serious trouble to you, and that you do not leave this exciting business. I hope that someone else can teach it to you in a way that doesn't give you indigestion, and that you will find someday that, after all, it isn't as horrible as it looks.

Finally, may I add that the main purpose of my teaching has not been to prepare you for some examination—it was not even to prepare you to serve industry or the military. I wanted most to give you some appreciation of the wonderful world and the physicist's way of looking at it, which, I believe, is a major part of the true culture of modern times. (There are probably professors of other subjects who would object, but I believe that they are completely wrong.).

Perhaps you will not only have some appreciation of this culture; it is even possible that you may want to join in the greatest adventure that the human mind has ever begun.
What does Feynman mean by the true culture of modern times? Not mincing words, he refers to the greatest adventure that the human mind has ever begun! None can claim themselves an educated thinker or intellectual without mastery of a significant portion of the material in these lectures.

The figure below is from book III chapter 01: Quantum behavior

Friday, December 05, 2014

Dept. of Physicists Can Do Stuff: Ashton Carter

Secretary of Defense nominee Ashton B. Carter on his education and early career in theoretical physics. His Wikipedia entry says he did postdocs at Rockefeller University and MIT.
... when I rather unexpectedly was accepted into a good college, Yale, I was determined to make the most of it. I disdained the “preppies” and other privileged students who seemed to regard college as an opportunity to enjoy freedom at long last. I was an intensely serious student, what would probably be called today a “grind.”

At Yale I ended up pursuing two entirely different majors – physics and medieval history. There was no relationship between them in my mind except that both fascinated me. I liked dusty archives, learning to decipher manuscripts in medieval script, and learning all the languages necessary to read the primary and secondary historical literature, especially Latin. I wrote a senior thesis on the use of Latin by contemporary monastic writers to describe the vibrant world of 12th century Flanders in which they lived. I also enjoyed English legal history and the foundations of the Common Law as established in the 11th through 13th centuries. I also did a lot of work on the hagiography of Saint Denis, patron saint of the French monarchy during its formative period in the 9th century.

Physics was entirely different: clean and modern, logical and mathematical. I was lucky enough to be asked by a professor to assist him on an experiment in elementary particle physics at the then-new Fermilab outside of Chicago, home of the world’s largest particle accelerator. I would fly back and forth from New Haven to Chicago, feeling very serious and very important. We were involved in the search for the quark, a sub-atomic particle then only theorized. I eventually wrote my senior thesis, which was later published, on the “charmed quark.”

As far as course choice was concerned, I had no interest in between the extremes of medieval history (history, language, philosophy) on the one hand, and science (physics, chemistry, mathematics) on the other. It may sound shocking to Kennedy School students, but I have taken exactly zero social science courses in my entire life. My arrogant view at the time was that life would eventually teach me political science, sociology, psychology, and even economics, but it would never teach me linear algebra or Latin. It seemed best to get my tuition’s worth from the other topics and get my social science for free!

The end of college brought the usual crisis of what to do next. Such a bimodal distribution of training and interests made the problem more acute. The default solution was to go to medical school, since my father was a physician and I had worked in hospitals back in Philadelphia.

Fortunately, I was rescued from this dilemma by the awarding of a Rhodes scholarship, entitling me to free study at Oxford University. Many Rhodes scholars pursue a second Bachelors degree or a Masters degree at Oxford, but I was still a man in a hurry. I decided I would use the free funding to get my doctorate in theoretical physics. Oxford did not have enough money to have world class experimental facilities in elementary particle physics, but it had a great theoretical physics department. All you need for theoretical physics is a pencil and paper and the ability to sit for hours of intense concentration with a page of equations in front of you. I worked on the theory of quantum chromodynamics, the quantum field theory then postulated to explain the behavior of nuclear reactions and the structure of the sub-atomic zoo of particles. Unfortunately, it was a mathematical theory so complex that its equations could not be solved. I found a way to solve its equations in certain special circumstances, thus allowing it to be tested against experiments. Oxford was a very lively intellectual community. The expatriate Americans would spend long hours debating the topics of the day. Much of my otherwise lacking social science training occurred by osmosis in the pubs with Rhodes friends.

I had no doubt, however, that I wanted a career of thinking and writing in academia, then meaning theoretical physics. I therefore went back to the United States to start to climb the academic ladder in physics, beginning in the usual way with a postdoctoral appointment. I wrote several papers. The one of which I am proudest and which is still frequently cited, was on “time reversal invariance,” the proposition that the world could run backwards according to the same laws by which it runs forwards. While this may seem like a bizarre question to ask, such a symmetry in nature, if it exists, is actually a very fundamental property of our universe.

A Turning Point

I was happily building an academic career in theoretical physics when a serendipitous opportunity arose which opened up an entirely new vista for me. The year was 1979 and the Cold War was ratcheting up to a new peak of tension and the nuclear arsenals to new levels of potential destructiveness. My field of physics dated itself to the wartime Manhattan Project, and many of the senior figures in my field had long participated in the furtherance, but also in the control, of military technology. It was their view that their successor generations had a responsibility to remain involved in these matters. Thus, several senior figures in the field urged me to take a one-year leave of absence from theoretical physics to join a study team of scientists being assembled at the Congressional Office of Technology Assessment. ...
See also Physicists Can Do Stuff and Wandering Physicists.

CRISPR patent fight

Earlier CRISPR posts. MSU symposium with video. Patrick Hsu, one of the speakers (no relation), is from the Zhang lab.
Technology Review: Discovery of the Century?

There’s a bitter fight over the patents for CRISPR, a breakthrough new form of DNA editing.

... In April of this year, Zhang and the Broad won the first of several sweeping patents that cover using CRISPR in eukaryotes—or any species whose cells contain a nucleus (see “Broad Institute Gets Patent on Revolutionary Gene-Editing Method”). That meant that they’d won the rights to use CRISPR in mice, pigs, cattle, humans—in essence, in every creature other than bacteria.

The patent came as a shock to some. That was because Broad had paid extra to get it reviewed very quickly, in less than six months, and few knew it was coming. Along with the patent came more than 1,000 pages of documents. According to Zhang, Doudna’s predictions in her own earlier patent application that her discovery would work in humans was “mere conjecture” and that, instead, he was the first to show it, in a separate and “surprising” act of invention.

The patent documents have caused consternation. The scientific literature shows that several scientists managed to get CRISPR to work in human cells. In fact, its easy reproducibility in different organisms is the technology’s most exciting hallmark. That would suggest that, in patent terms, it was “obvious” that CRISPR would work in human cells, and that Zhang’s invention might not be worthy of its own patent.

What’s more, there’s scientific credit at stake. In order to show he was “first to invent” the use of CRISPR-Cas in human cells, Zhang supplied snapshots of lab notebooks that he says show he had the system up and running in early 2012, even before Doudna and Charpentier published their results or filed their own patent application. That timeline would mean he hit on the CRISPR-Cas editing system independently. In an interview, Zhang affirmed he’d made the discoveries on his own. Asked what he’d learned from Doudna and Charpentier’s paper, he said “not much.”

Not everyone is convinced. “All I can say is that we did it in my lab with Jennifer Doudna,” says Charpentier, now a professor at the Helmholtz Centre for Infection Research and Hannover Medical School in Germany. “Everything here is very exaggerated because this is one of those unique cases of a technology that people can really pick up easily, and it’s changing researchers’ lives. Things are happening fast, maybe a bit too fast.”

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