See the full episode at http://video.pbs.org/video/1286437550In 1858 Charles Darwin received a letter from naturalist Alfred Wallace, explaining his own theory of evolution. This was the trigger event that led to the publication of Darwin's seminal theory on the origin of species. The two-hour drama premieres Tuesday, October 6th at 8PM ET/PT on PBS (please check local listings). http://www.pbs.org/wgbh/nova/darwin/
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