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The 10,000 Year Explosion: How Civilization Accelerated Human Evolution

by Gregory Cochran, Henry Harpending

ISBN-10: 9780465002214
ISBN-10: 0-465-00221-8
ISBN-13: 9780465002214
ISBN-13: 978-0-465-00221-4
Hardcover
2009-01-27
Basic Books


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Product Description

Resistance to malaria. Blue eyes. Lactose tolerance. What do all of these traits have in common? Every one of them has emerged in the last 10,000 years.


Scientists have long believed that the “great leap forward” that occurred some 40,000 to 50,000 years ago in Europe marked end of significant biological evolution in humans. In this stunningly original account of our evolutionary history, top scholars Gregory Cochran and Henry Harpending reject this conventional wisdom and reveal that the human species has undergone a storm of genetic change much more recently. Human evolution in fact accelerated after civilization arose, they contend, and these ongoing changes have played a pivotal role in human history. They argue that biology explains the expansion of the Indo-Europeans, the European conquest of the Americas, and European Jews' rise to intellectual prominence. In each of these cases, the key was recent genetic change: adult milk tolerance in the early Indo-Europeans that allowed for a new way of life, increased disease resistance among the Europeans settling America, and new versions of neurological genes among European Jews.


Ranging across subjects as diverse as human domestication, Neanderthal hybridization, and IQ tests, Cochran and Harpending's analysis demonstrates convincingly that human genetics have changed and can continue to change much more rapidly than scientists have previously believed. A provocative and fascinating new look at human evolution that turns conventional wisdom on its head, The 10,000 Year Explosion reveals the ongoing interplay between culture and biology in the making of the human race.
 


Reviews


Genetic Science and Anthropology
The 10,000 Year Explosion provides a a different view of human evolution and culture. The anthropology community believes human evolution stopped 40,000 years ago. Cochran and Harpending disagree and in fact argue it has accelerated and is moving at a tremendous rate now. Genetics have influence on culture as culture influences genetics. With humans, this is happening faster than other species due to our ability to make great changes in our environments. The boot is well researched and easy to read. It is seasoned with subtle humor. If you have an interest in what the recent genetic science has discovered and what it may mean for us, read this book.

The (controversial) outcome of natural selection
I found the style of the book a bit arrogant and somewhat stuffy, but the conclusions, and the entire exposition, have tremendous weight. This is very good science, sure to generate much controversy. The point(s) the authors make will be hard to disprove, and may soon become mainstream in Evolutionary theory, even if the points may seem offensive to many people (which would be a wrong interpretation). Facts are facts, and on interpreting facts is that science progresses. That's what the authors are doing in this book.

Once you get past the stylistic problem, you appreciate the importance of this book.

Convincing argument for between-population genomic differences
The "blank slate" view of human nature has vanished from cutting-edge social science. It has been replaced by the view that humans are identically endowed with evolved cognitive modules; that those modules respond to environmental cues; and that behavioral differences across populations are simply due to different environments. Biology has been introduced into the discourse, but the prevailing view still maintains that human populations do not vary from each other in their genome--the current assumption is that human adaptive evolution stopped 50,000 years ago, with the last major migration out of Africa.

But, as Cochran and Harpending point out, two factors suggest that human evolution has actually accelerated, especially over the last 10,000 years: first, the increasing size of populations increases the number of mutations available for selection; and second, the migration into extremely varied habitats, as well as the changes in diet and social organization associated with agriculture, have created new environments to which humans must adapt. For example, the grindingly hard work of agriculture would give a selective advantage to genes for endurance, rather than genes for sharp bursts of speed (which would be advantageous for hunters). One can therefore reasonably expect many genomic differences between populations, especially between populations of foragers and populations with a long history of farming.

The authors are able to ground most of their speculations in data from the many genomic studies of the past decade. And though much of what they say has already been published (and summarized in places such as the GeneExpression blog), the book puts it all together in a very readable and convincing way. Parts of the book are really exciting--I was particularly impressed by their persuasive argument that introgression of genes from archaic humans may have accounted for the Upper Paleolithic revolution.

Human genetic adaptation continues
We continue to be simply a work in progress. Is not what you've always heard, is it? That the major ongoing changes are cultural, not genetic. But the premise is that the rise of agriculture as far back as nearly 10,000 years ago selected agriculturists (us, their descendants) with certain qualities best adapted to that life. To its diseases, its wars, its politics, its carbohydrates, its property rights, its poorer nutrition (Yes!), its technologies, its anti-egalitarianism, its suppression of women's power, its schools, its markets, its trading, its money, its explorations.

All these things were agencies of selection for the genes present in the human gene pool since hunter/gatherer times which would best adapt the human species exposed to agriculture. And we did adapt. We don't challenge authority much; instead we cower, cringe, obey. Until relatively recently in modern history we were much shorter than prehistoric modern humans. We developed genetic adaptations to numerous diseases the etiology of which was urban crowding.

Those who, of necessity, were restricted to "mind work" occupations such as money lending prospered, had more children survive, and passed on the higher mental abilities required for that work. This is a theory about how the Ashkenazy Jews ended up having not an average IQ of 100, but rather up around 114, with the consequence that as a result of the bell shaped curve of the range of IQ in a population they had a higher percentage of really bright people (they far outshine other populations in that respect).

Our western European adaptation to disease was the proximate cause of terrible epidemics in the native populations of the Americas when Pilgrims and Conquistadors arrived in the New World. Additionally, the hunter/gatherer peoples of the New World had genetic baggage useful to them in their way of life but not optimally adapted to the European lifestyle. Some refused to be slaves (the way we are). They refused to breed more slaves or work in mines, and even killed themselves. They shared; we don't. They were hierarchy deficient; we are hierarchy rich.

The 10,000 Year Explosion is readable. It has a plausible thesis. It will explain to you more about why we are the way we are. That devil, agriculture-driven civilization, made us do it - explore the world and even leap into space. We are the domesticated version of Homo Sapiens Sapiens.

Illuminating but slightly unconvincing
This book is very interesting and presented a fascinating theory. I enjoyed the no-holds barred look at the truth, regardless of whether the findings will be popular and politically correct. Such should be the essence of science. Most of the time I found myself nodding in agreement but as much as I would like this hypothesis to be true, I couldn't help but feeling as if the author's evidence was at times on shaky ground. Granted, most of the work is well supported and readily apparent. It just felt like some parts were insufficiently argued. This is often because the area hasn't been studied thoroughly enough or it is difficult, nigh impossible to find results. But overall a very interesting read that presents a compelling case for their hypothesis. For years, the recent evolution of humanity has been off limits as if everybody knew there was nothing to study, but yet nobody had studied it. The authors present a compelling case for why this should deserve scrutiny.


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