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Professor Richard Hoover studies extreme weather conditions to find new extremophiles - micro organisms that can live in extreme weather conditions and climates. Watch this interesting video from BBC Horizon show 'We Are the Aliens' to discover the weird life forms that populate frozen penguin guana, nuclear fuel rods, and hot water.

Stephen Hawking - How Did Life Begin?

Stephen Hawking explains how life may have began on Earth, and turns to evolution to determine what extraterrestrial life may look like.

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