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Cochran And Harpending Update Darwin: Human Evolution Is Continuing!
This Thursday, February 12, 2009, marks the 200th anniversary of the birth of Charles Darwin, author of the 1859 book On the Origin of Species by Means of Natural Selection: Or The Preservation of Favoured Races in the Struggle for Life.
I'm pleased that a new book, The 10,000 Year Explosion: How Civilization Accelerated Human Evolution, demonstrates that Darwin has two worthy 21st Century successors of comparable insight and ambition: co-authors Gregory Cochran and Henry Harpending. (They've set up an official website for The 10,000 Year Explosion here).
On a rather less epochal note, the publication of The 10,000 Year Explosion marks the tenth anniversary of my invitation-only Human Biodiversity email group, which I started in 1999.
And that's where Greg and Henry got to know each other! Peter Brimelow recently called to my attention that the inscription on the Westminster Abbey tomb of concert impresario J.P. Salomon reads, "He brought Haydn to England …" Perhaps my gravestone will read, "He introduced Cochran to Harpending."
Henry Harpending, a professor at the
Utah and member of the National Academy of Sciences, is
one of the few field anthropologists (he lived for 42 months
with hunter-gatherer peoples in
(Here's Henry's hair-raising tale of going hunting with Bushmen for the most lethal African game animal, the Cape buffalo.)
Greg Cochran, a physicist turned evolutionary
theorist, is a
who might be the most ferociously brilliant idea man of his
Obviously, I'm biased about their The 10,000 Year Explosion. Over the last decade, I've spent perhaps a thousand hours talking to Greg Cochran on the phone. Or, to be more accurate, listening to Greg, which is how I've gotten a sizable fraction of my best ideas. (My worst ideas are all mine.)
On the first page of The 10,000 Year Explosion, Cochran and Harpending quote the reigning conventional wisdom about humanity:
"There's been no biological change in humans in 40,000 or 50,000 years. Everything we call culture and civilization we've built with the same body and brain."— Stephen Jay Gould
The co-authors then announce that they will undermine this standard presumption:
"We intend to make the case that human evolution has accelerated in the past 10,000 years, rather than slowing or stopping, and is now happening about 100 times faster than its long-term average over the 6 million years of our existence. The pace has been so rapid that humans have changed significantly in body and mind over recorded history. Sargon and Imhotep were different from you genetically as well as culturally."
As Greg quips, "The past may never be the same again."
While Cochran and Harpending don't have much respect for Gould, their book serves to complement the much-touted Jared Diamond's 1997 bestseller Guns, Germs, and Steel, showing you what Diamond left out in his successful bid for political correctness.
So, what happened 10,000 years ago?
"In Guns, Germs, and Steel, Jared Diamond observed: 'A larger area or population means more potential inventors, more competing societies, more innovations available to adopt—and more pressure to adopt and retain innovations, because societies failing to do well will be eliminated by competing societies.' We take this idea a step further: There are also more genetic innovations in that larger population."
A hundred-fold growth in world population from its pre-agriculture size to the 60 million alive during the Bronze Age 3,000 years ago meant a similar hundred-fold increase in the rate of genetic mutations.
Most random changes in DNA are deleterious and eventually die out. But favorable mutations, which improve the odds of survival and reproduction, are more likely to thrive and spread.
Cochran and Harpending make the crucial mathematical point that a large population size increases the rate of favorable mutations much faster than it slows their dispersion:
"One might think that it would take much longer for a favorable mutation to spread through such a large population than it would for one to spread through a population as small as the one that existed in the Old Stone Age. But … it takes only twice as long to spread through a population of 100 million as it does to spread through a population of 10,000. "
Moreover, agriculture dramatically changed the environment that selects which mutations turn out to be favorable. To flourish, farmers have to be harder-working than hunter-gatherers, more orderly in densely crowded locations, less susceptible to alcoholism, and more foresighted (farmers can't eat the seed corn). Harpending writes of his Bushmen friends:
"They weren't very good at self-denial back in the early Neolithic period, and they aren't very good at it even today: Efforts to teach Bushmen to become herders frequently fail when they eat all their goats."
Different cultures bring about different genes.
Therefore, different kinds of agriculture select for
different genes. For example, the "female farming"
cultures of tropical
Conversely, different genes bring about different cultures, at least in the short run.
The authors illustrate their theories with countless
historical and prehistorical examples, such as the beautiful
Going back further in time, a mutation for
lactose-tolerance among adults emerged about 8,000 years
ago and has since spread across a vast swath of western
Lactose tolerance dramatically increased the
Darwinian fitness of people living in grasslands because
keeping cows for milk rather than just for meat produces
five times the calories. Cochran and Harpending theorize
that this lactose tolerance mutation accounts for the
remarkable spread of Indo-European languages from
"If this picture is correct, the occurrence of a single mutation in a particular group of pastoralists some 8,000 years ago eventually determined the spoken language of half of mankind."
The 10,000 Year Explosion outlines a new type of scholarship: "genetic
history," in which
differences between groups can drive major events. For
example, the astonishing conquests of the
great empires of
Most controversially, Cochran and Harpending make a strong case that the high average IQs seen today among Ashkenazi (Central European) Jews are the results of Darwinian selection for mental skills useful in the finance-related jobs held by so many medieval Ashkenazi. I summarized this audacious theory in VDARE.com back in 2005, but their new write-up is the best version yet.
The 10,000 Year Explosion features enough original ideas to launch a hundred Ph.D. dissertations. What proportion of their suggestions will turn out to be right, I don't know. They're founding a new branch of knowledge, so it will take decades to find out.
Despite this density of novel notions, the book is remarkably readable. It's much smoother sailing than On the Origin of Species. In fact, The 10,000 Year Explosion scores on the Microsoft Word readability scales as easier to read than my review of it. (One of the "deleted scenes" featured on the book's website rings up a Flesch Reading Ease score of 45.1 and a Flesch-Kincade Grade Level of 12.5—not bad for a breakthrough book.) The writing style is a combination of casual and pithy, with a joke every couple of pages.
Still, you can't just breeze through this book. I found myself cruising along muttering, "Oh, yeah, that makes sense, I get it, yeah, I get that too, no problem, I get it, I get it, I …I … I … Wait a minute, where'd that idea come from?" And then I have to backtrack and think it over.
A century and a half ago,
"In the distant future I see open fields for far more important researches. Psychology will be based on a new foundation, that of the necessary acquirement of each mental power and capacity by gradation."
Just as scientists still reread
[Steve Sailer (email him) is movie critic for The American Conservative. His website www.iSteve.blogspot.com features his daily blog. His new book, AMERICA'S HALF-BLOOD PRINCE: BARACK OBAMA'S "STORY OF RACE AND INHERITANCE", is available here.]