Defeating Gravity Big History : Season 1 Episode 6
H2 22m int(0)
Aired: November 16th, 2013 @ 10:00 PM EST on H2
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 Earth is the perfect planet for flight.