Defeating Gravity

Nov 16, 2013 on H2 at 10:00 PM


Flight takes more than wings. We need the right kind of air, the perfect materials cooked up over billions of years, and cosmic forces that are just right for us to leave the ground without tumbling off into space. Big History reveals how planet Eart... (more)h is the perfect planet for flight.

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Season 1 Episode 5

Nov 16, 2013

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Brain Boost
Season 1 Episode 7

Nov 23, 2013