Someday soon, you'll stand on your front lawn, tapping your toe impatiently, waiting for a pair of shoes to fall from the sky. You’ll hear a distant buzzing, then see a brightly colored aircraft come over the trees, its falcon wings arcing out gracefully from the body, four blades whirring intently to ease the aircraft into a steady hover. It’ll touch down at your feet, and you’ll be able to reach in, grab your new kicks, and head off on your vacation.

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