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The invisible wall of air
Discover how the invisible ocean of air around us slows down falling feathers, shapes ultra-fast race cars, and sets speed limits for skydivers.
4 chapters75 assets
by artiteacher · Sep 30, 2026
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Chapter 1
The great fall: gravity versus air
1Galileo challenges the ancient Greek masters
2A hammer and a feather on the Moon
3Meet the invisible fluid called air
4Creating the world's first artificial vacuum
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Chapter 2
Terminal velocity: the speed limit of falling
1When gravity and drag reach a truce
2The speed limits of human flight
3Nature's high-flying survival experts
4Why ants are immune to falling damage
5Jumping from the edge of space
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Chapter 3
Catching the wind: the art of the parachute
1Leonardo da Vinci's pyramid of safety
2The first modern leap of faith
3The secret of the swinging parachute
4Slowing down on the red planet
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Chapter 4
Slicing the sky: cheating drag on the ground
1The teardrop: nature's ultimate speed shape
2Formula 1 and the upside-down airplane
3The kingfisher that quieted bullet trains
4Drafting behind the leader to save energy
5Active aerodynamics: wings that move on command
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