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As the Earth heats up at a dangerous rate and fossil fuels become scarcer, ordinary...
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The story of how African-American Percy Julian defied the odds to become a famous chemist.

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Meet the cuttlefish, one of the brainiest, most bizarre animals in the ocean.
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NOVA  ·  Episode 3404

The Last Great Ape

02/01/2010

Why did the Incas abandon their city in the clouds?

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