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Why are there so many forms of life? Textbooks abound with evolutionary 'trees' purporting to explain how life evolved from simple cells, lacking even a primitive nucleus through the complex creatures around us today. Most of these diagrams are fallacious, burdening our understanding with the idea that evolution is 'progressive'. Lewin's account, laced with more realistic graphics, show that all forms of life that once existed, still do in parallel with our own companions on this planet. This book does a superior job relating how molecular biology has enabled researchers to update the picture of humanity's place in the structure of nature. Lewin builds his picture of the human role slowly and carefully, but at the conclusion, you will find he's performed the task to near perfection. His description of the Mitochondrial Eve hypothesis, for example, leaves you better informed on this idea than any other popular account.
His writing in this account achieves a level rather more elevated than his other books. BONES OF CONTENTION, or his books co-authored with Richard Leakey are definitely easier reading. The level of information here, however, is also far greater than offered in his other books. This book clearly displays his move from New Scientist to Science in its prose. That's not a criticism, but some readers may find this book more daunting than his others. Nevertheless, the information offered here is worthy of any reader's scrutiny. If you want to know what your DNA is up to and how science has figured out how to describe it, this is the book to have.
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Best of all, this time he takes us along on the adventure of discovery. Leakey is no closeted academic; he can find food and water as the ancient hunter-gatherers did, with no modern tools, in what looks to the untrained eye like a dry wasteland. He understands the politics of the illegal ivory trade as well as the interpretation of fossils. He was not stopped in either his explorations of human origins or his quest to save African wildlife by years of kidney failure, near-fatal pneumonia, death threats from poachers, or even the loss of his legs in a plane crash. He covers the science in full detail, yet the reader has a sense of immediacy one never gets from the academic literature. We are parties to acrimonious debate and feel the thrill of pouncing on the apparent error of a rival. We spend months in the bush, and are immersed in a lifelong search that yields, after innumerable frustrations, to the occasional astonishing discovery.
There are a few shortcomings; Leakey glosses over some of the points he made eloquently in the first book which turned out, in retrospect, to be radically incorrect. The photographs, critical to understanding the discussion, are grouped together and hard to relate to the appropriate text, and the critical diagrams of the human evolutionary tree are small and difficult to read. But overall, the theory is so cogently explained, and the narrative has such a sense of realism, that we feel we could do it ourselves, flying over the Great Rift, sifting through ancient sand and rock, pushing back the frontiers of time to discover ourselves.
The reconstruction of social necessities from the fossil record is excellently done. The lesson regarding (the lack of) directed-ness in evolutionary trajectory should not be missed. The human evolutionary tree has become the evolutionary bush, with mostly dead branches. One might speculate on the fate of current primate relatives given the fate of Homo Neandertalensis, Homo Heidelbergensis and Homo Erectus, all existing when Homo Sapien emerged. Additionally, the example of persistent coevolution of related anatomic or ontogenetic phenotypic expressions such as lengthening childhood, larger mature female birth canals and expanding brain size represent evolutionary puzzles with more than a touch of mystery.
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Tracing the line of our ancestors is becoming an increasingly involved process. From skimpy fossil records, scattered over remote locations around the globe, researchers are striving to understand which line depicts the path of our evolution and which branches have split off to expire without further contribution. Once the evidence lay with bones, how they were formed, changed, and contributed to resulting modern humans. Lewin recounts that the fossil record is no longer enough, and advanced technologies can tease out answers from the most subtle clue.
Lewin's account of Misia Landau's study of paleoanthropologists as perpetrators of "hero myths" is a splendid beginning. Because the basic issue is: "how did we become the way we are", then all the stories on human evolution begin at the end - today's human. The "big names" in the field each addressed this question with vigour. Each interpreted the evidence with force, but not always based on what the evidence warranted. It surely follows that "contention" is an inevitable result. There simply weren't enough fossils to realistically trace the human lineage.
Using Landau's ideas as a foundation, Lewin traces the history of thinking on human evolution through paleoanthropology's leading figures. From Raymond Dart's Taung Child through the Ramapithecus, Lewin depicts how many paths have been drawn of the human lineage by able workers. New evidence has forced constant revision. For years, the most notable revisionist was the Leakey family, Louis, Mary and Richard. The Leakey's finds kept urging the origins of humans into a remoter past. A very remote past. A past abruptly truncated by Don Johanson's find of Lucy, and by the introduction of new technologies.
Lewin takes us through the problems of dating fossils and tracing evolutionary paths with superior journalist's skill. Tracing elusive chemicals and microscopic tracks in rock crystals shouldn't make for heady reading. Lewin, following Landau, demonstrates how the science can be clouded by personalities and ambitions. The KBS Tuff chapters don't become mired in technology, but give the research a human, if not always pleasant, aspect. Lewin shows clearly how the controversies must be endured in order to present the clearest picture of how humanity evolved. This is a highly informative book, written from a fervent interest in the topic. You cannot help being drawn into the story.