Dr Carl Sagan takes us on a great reading adventure, offering his vivid and startling insights into the brains of humans & beasts, the origin of human intelligence, the function of our most haunting legends and their amazing links to recent discoveries.

    His genius as an essayist lies in his unmatched ability to use his knowledge of the world, including popular culture, to illuminate the realm of science.Ever Since Darwin, Stephen Jay Gould's first book, has sold more than a quarter of a million copies. Like all succeeding collections by this unique writer, it brings the art of the scientific essay to unparalleled heights.

    Discusses the evolution of prehistoric ape-like creatures into human beings, theorizing that the key to this transformation was the ability to share & cooperate in a social context.

    Gould explores recapitulation as an idea that intrigued politicians and theologians as well as scientists. He shows that Haeckel's hypothesis--that human fetuses with gill slits are, literally, tiny fish, exact replicas of their water-breathing ancestors--had an influence that extended beyond biology into education, criminology, psychoanalysis (Freud and Jung were devout recapitulationists), and racism. The theory of recapitulation, Gould argues, finally collapsed not from the weight of contrary data, but because the rise of Mendelian genetics rendered it untenable.Turning to modern concepts, Gould demonstrates that, even though the whole subject of parallels between ontogeny and phylogeny fell into disrepute, it is still one of the great themes of evolutionary biology. Heterochrony--changes in developmental timing, producing parallels between ontogeny and phylogeny--is shown to be crucial to an understanding of gene regulation, the key to any rapprochement between molecular and evolutionary biology. Gould argues that the primary evolutionary value of heterochrony may lie in immediate ecological advantages for slow or rapid maturation, rather than in long-term changes of form, as all previous theories proclaimed.Neoteny--the opposite of recapitulation--is shown to be the most important determinant of human evolution. We have evolved by retaining the juvenile characters of our ancestors and have achieved both behavioral flexibility and our characteristic morphology thereby (large brains by prolonged retention of rapid fetal growth rates, for example).Gould concludes that "there may be nothing new under the sun, but permutation of the old within complex systems can do wonders. As biologists, we deal directly with the kind of material complexity that confers an unbounded potential upon simple, continuous changes in underlying processes. This is the chief joy of our science."

    As it unfolds under the reader's eyes, there emerges from it the vision of one universsal order that rises above the underlying chaos in which our lives are still so largely immersed. By bringing together in one perspective the physical universe, the evolution of life within it, the emergence of mind, and the fruits of mind's creativity, Halle reveals, step by step, what presents itself at last as a seamless whole. We see how order arises out of the fundamental chaos represented by the Uncertainty Principle in physics, or by the "Extended Uncertainty Principle" that applies to all aspects of being."

    a textbook in evolution courses, particularly for advanced undergraduates and for graduate students. The book is also intended for a more general reader who wants to know about the spectacular advances that have taken place in evolutionary studies ...