Where did the propeller idea come from? I've never actually seen a Whirly Bird. Do they exist? Did helicopters just report traffic via balloons? And what came first... the rubber band or the propeller. Remember those Balsam Wood Gliders that propelled themselves by winding the propeller till the rubber band was twisted in knots? And if you were lucky they'd land safely on their wired axles & 2 plastic coat buttons. We've come along way since Balsam Wood Pterodactyls & Hot Air Blowfish.
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