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In less than two minutes in March, a one-square-mile field of debris slammed into the...
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Almost a century ago, paleontologists found the first tantalizing hints of a monster even...

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How did fighter planes evolve from rickety biplanes into deadly machines during WWI?
NOVA  ·  Episode 4120

Emperor's Ghost Army


Explore the buried clay warriors, chariots, and bronze weapons of China’s first emperor.

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