In his previous books the British biologist has presented new ways of looking at evolution, demolished barriers to understanding it and traced the family tree of all life back through its branching points to a single origin. These books all started with evolution. But in the bicentennial year of Darwin's birth Mr Dawkins fills a gap in his oeuvre by setting out the evidence that the "theory" of evolution is a fact -- "as incontrovertible a fact as any in science".
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See also:
Richard Dawkins - The Greatest Show On Earth
Review: The Greatest Show on Earth
The Greatest Show on Earth: the Evidence for Evolution by Richard Dawkins: review
The Greatest Show on Earth