How Do Aliens Think?

Through the Wormhole

19th June 2013 44 mins Season 4 Episode 4

If the stuff of life is spread throughout the cosmos, then the universe could be teeming with aliens.

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Season 4 · Episode 5

Will Sex Become Extinct?

Every single person who has ever lived was created from the genes of one man and one woman. But human sexual reproduction, unchanged for millions of years, is about to undergo radical change.

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