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Ep293 - Professor Richard Dawkins | The Magic of Reality

Talks at Google

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How Long Would a 40 Mile Long Bookshelf Be?

Every 10,000 years the new people and animals that we see are going to be pretty similar. And indeed they can interbreed if they feel like it. We now walk along our great big 40 mile long bookshelf. Every picture shows a creature belonging to the same species as its immediate neighbours on the shelf. Yet if you go back sufficiently far, for example, well your 4000 greats grandfather, you see there, looks pretty much like us. Your 50,000 greats grandfather looks just a bit different. He would have been perhaps a member of the species homo erectus,. not the same species but pretty similar nevertheless.

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