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WJW
on July 14, 2020
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Andean condor can fly for 100 miles without flappi...
Helicopters and quadcopters provide lift through rotary wings, thereby gliding. Fair point about balloons though.
ajuc
on July 14, 2020
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That's like saying cars are moving by turning (because their wheels do that).
meheleventyone
on July 14, 2020
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Cars are moved by turning though. From the pistons driving the engine, through the gearbox and drivetrain to the wheels.
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