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Mass graves and forensic evidence reveal a complex truth about how the Inca Empire fell.
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Why did the Incas abandon their city in the clouds?

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The story of how African-American Percy Julian defied the odds to become a famous chemist.
NOVA  ·  Episode 3407

Saved by the Sun


As the Earth heats up at a dangerous rate and fossil fuels become scarcer, ordinary citizens and businesses are bypassing the federal government to lead the way in exploring a clean, renewable source of power: the sun.

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