The very best whodunnits stand or fall by last page. On that page the author explains not only who dunnit, but how and why. When you read the how you should not be left thinking that your own idea was just as good. Once explained, it should be completely obvious. The intelligent reader should be left slapping his or her forehead and exclaiming "how did I miss that?".
Dawkins's explanation of evolution is just as complete. His entire book has the beauty of an explanation that slots together perfectly. Dawkins shows that natural selection not only explains every aspect of life but renders other explanations unnecessary. Any additions to the theory add more questions than answers. I particularly reveled in Dawkins's explanation of the evolutionary reasons why some people find evolution hard to accept...
At no point does Dawkins, or Darwin, suggest that evolution is explained by blind chance.
Dawkins conclusively shows that in every case life has evolved by natural selection. The examples produced by the most supersitious critics of Darwin, such as the eye and the human brain, are picked up and explained totally by Dawkins. Every organ that exists in nature is one that is capable of evolving by simple steps, every one of which bestows clear advantages. At every stage from a cluster of light sensitive cells to a fully functioning eye we have an easily understood process. By contrast, organs or limbs which could not have evolved, such as wheels, at least on land animals, do not exist. We are left with two possible explanations: evolution by natural selection or intelligent design by a designer who has deliberately chosen to disguise his work as evolution by natural selection.
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