I thought the first part of the book which was actually about the prehistory as newly discovered through DNA analysis was very interesting. I was less thrilled with the chapters on Race, Language and History. The wrap up chapter on Evolution was good, if a bit repetitious.
Wade writes extremely well and does a good job of summarizing the latest (circa 2005) research, much of which has come from analyses of the descent of the Y chromosome (from men) and mitochondrial DNA handed down through the female line. The question of our relationship with the Neanderthal--long a thorny question--is more or less resolved with DNA extracted from Neanderthal fossil bones that has been compared to the sequences of human DNA. The conclusion is that H. neanderthalensis came from H. ergaster through H. heidelbergensis as H. sapiens did, and then broke off on its own. Furthermore there is no genetic evidence that human and Neanderthal produced viable offspring. The earlier idea than the Neanderthal was a modification of the very successful H. erectus has been discredited.
As to the question of our origins, northeast sub-Saharan Africa is further confirmed as the site. Wade has humans becoming behavioral human around 50,000 years ago after becoming anatomically human as early as perhaps 200,000 years ago. The great leap forward occurring 50,000 years ago is attributed to the acquisition of symbolic, syntactic language. This was also the time when humans made the exodus out of Africa and began to colonize the world. They went east across the Red Sea at the Gate of Grief during a glacial period when the sea level was two hundred feet lower than it is today. They followed the coast line of the present Gulf of Aden and the Arabian Sea to India and eventually to Australia. I had previously though humans had gone north along the Red Sea to the Mediterranean and then east and then north to Europe. However, the evidence indicates that it was only later that humans migrated to Europe from India westward to replace the Neanderthal.
I had also always thought that agriculture came before settled communities, but it now appears that sedentism occurred first and was part of a behavioral and psychological change in humans that led to agriculture and eventually to cities and nation states. Just prior to or at about the same time as the first settlements appeared some 15,000 years ago occurred the domestication of the dog. Wade avers that living in settlements near a plentiful food source (wild grains, a bountiful river, etc.) was partially made possible by people using dogs as sentries against the ancient practice of dawn raids by neighboring tribes. Clearly the transition from the hunter-gatherer way of life to the settled way of life was a momentous one.
Perhaps the reason I wasn't so thrilled with the latter part of the book is that I read some of the studies Wade considers elsewhere. The experience of Brian Sykes in tracing the ancestry of people named "Sykes" and of Thomas Jefferson's second family with the slave Sally Hemings are examples of DNA derived stories that I had read before. Wade's account of the saga of the Ashkenazi Jews of Europe, although also a familiar story, is most interesting. He cites studies showing that Ashkenazi Jews have an average IQ of 115 while Sephardic and Oriental Jews have the usual average of 100. A couple of arguments are presented to account for this difference. The more plausible one is that because the Jews of Europe were forced by the Christian majority into becoming money lenders from about AD 1100 until around 1700. (Christianity at the time forbade usury.) That sort of intellectually demanding way of life, along with having to make a living amid persecution, selected for intelligence. By way of contrast, Sephardic and Oriental Jews during the same period "lived mostly under Muslim rulers who often forced them into menial jobs, not the intellect-demanding ones imposed on Ashkenazim." (p. 256)
More than any other book I have read, "Before the Dawn" insists on cultural change leading rapidly to genetic change. With the experience of the Ashkenazi Jews as a case in point, Wade argues more generally that "for social species the most important feature of the environment [which directs evolutionary change] is their own society." He concludes that "to the extent that people have shaped their own society, they have determined the conditions of their own evolution." (p. 267.
This might be termed "evolution by your own boot straps." I wonder however if it isn't a sort of fallacy. Biological evolution shapes human behavior which in turn leads to cultural change which leads to further biological evolution. I think it is better to speak of cultural evolution as a subset of biological evolution and not imply that somehow we have begun to direct the process. But this may be just a quibbling over semantics. Clearly the environment has changed us and we have changed the environment.
In the final chapter Wade speculates on where we are going. I always like such speculations but only really appreciate those that have us becoming post-human in some way. Wade posits one possibility that I have not thought about in years, that of humans splitting into two or more species. He notes: "Our previous reaction to kindred species was to exterminate them, but we have mellowed a lot in the last 50,000 years." (p. 279)
By the way, this idea that we "have mellowed a lot," and become less aggressive since we have domesticated ourselves is one that appears elsewhere in the book and is an idea that, for better or for worse, appears surprisingly to be true. The actually percentage of humans killed during warfare appears to have been much greater during the prehistory than it is today. The wars today are much bigger but the wars in the pre-history, according to the research presented here, were nearly constant.
(Note: thirteen of my books are now available at Amazon including "Understanding Evolution and Ourselves.")
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