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How did the ancient Athenians build this near-flawless icon of Greece's golden age?...
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An elite corps of U.S. astronauts is trained to gather intelligence on the Soviets.

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What happened to American pilots shot down over Korea half a century ago?
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NOVA  ·  Episode 3502

The Four-Winged Dinosaur

02/26/2008

Surprising fossils from northeastern China spur a debate over how birds evolved.

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