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Last broadcast on Wed, 15 Jul 2009, 21:00 on BBC Radio 4.
Synopsis
Writer and naturalist Paul Evans meets Prof Lynn Margulis, whose study of the Earth's smallest creatures led to a revolutionary theory for all life on Earth. The cell, symbiosis, Gaia and a row with Richard Dawkins all combine to offer a new perspective on evolution.

Broadcast
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Wed 15 Jul 200921:00

