Carl Sagan on How the Greeks Knew Earth Was Round

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Man Reunites with Family After 30 Years Apart

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NASA Pumps 450,000 Gallons of Water in 30 Seconds

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How astronauts put on pants in space

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Apollo 11 Astronauts on Seeing Stars from the Moon

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Robbie Knievel's Grand Canyon Jump (1999)

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CL-415 Cockpit View While Scooping Water

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The Man Who Ascended 16,000 Feet in a Chair Tied t...

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Testosterone Doesn’t Cause Aggression

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How Octopuses Camouflage

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