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( Chapter 3, “The Brain and the Chariot”) But the Cassandric components of our nature are necessary for survival. Foretelling disaster is probably not much fun Pollyanna was much happier than Cassandra. The price we pay for the anticipation of our future is anxiety about it.From an evolutionary point of view this would be quite extraordinary: why should it have evolved if it had no function? But actually the statement is made on very little evidence. There is a popular contention that half or more of the brain is unused.Note that in all this interaction between mutation and natural selection, no moth is making a conscious effort to adapt to a changed environment.Fingers are not involved, at least directly, in the propagation of the species.
#Carl sagan contact book pdf skin#
A mutation in a DNA molecule within a chromosome of a skin cell in my index finger has no influence on heredity.It is important to distinguish between the amount of information and the quality of that information.At any rate, both because of the clear trend in the recent history of biology and because there is not a shred of evidence to support it, I will not in these pages entertain any hypotheses on what used to be called the mind-body dualism, the idea that inhabiting the matter of the body is something made of quite different stuff, called mind (Introduction).Those at too great a distance may, I am well aware, mistake ignorance for perspective.The entire recent history of biology shows that we are, to a remarkable degree, the results of the interactions of an extremely complex array of molecules and the aspect of biology that was once considered its holy of holies, the nature of the genetic material, has now been fundamentally understood in terms of the chemistry of its constituent nucleic acids, DNA and RNA, and their operational agents, the proteins.Absence of evidence is not evidence of absence.My fundamental premise about the brain is that its workings-what we sometimes call “mind”-are a consequence of its anatomy and physiology, and nothing more.I proffer the following ideas with a substantial degree of trepidation I know very well that many of them are speculative and can be proved or disproved on the anvil of experiment.The Varieties of Scientific Experience: A Personal View of the Search for God (with Ann Druyan)
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The Demon-Haunted World: Science as a Candle in the Dark (with Ann Druyan).Pale Blue Dot: A Vision of the Human Future in Space (with Ann Druyan).Shadows of Forgotten Ancestors: A Search for Who We Are (with Ann Druyan).
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