Complete video at: http://fora.tv/conference/new_yorker_...

Biologist and author Richard Dawkins presents a thought experiment to explain human origins. Following each generation backwards across millions of years of evolution, Dawkins shows why no species -- including homo sapiens -- can truly be said to have a "first" ancestor.

-----

What Is Reality? Richard Dawkins talks with Henry Finder. Presented in collaboration with the New Yorker Festival, on October 1, 2011.

Richard Dawkins is an evolutionary biologist and the author of the Times best-selling books The Selfish Gene, The God Delusion, and The Greatest Show on Earth. His new book, The Magic of Reality, an illustrated science guide for adults and young people, comes out in October. He is a Fellow of the Royal Society and of the Royal Society of Literature.

Henry Finder is the editorial director of The New Yorker.