Hello 21st Century, Now Where Is My Jetpack?

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Is there any more consistent image of science fiction than a flying man, propelled by a rocket jetpack? As early as 1920's Buck Rogers comics, there have been many fictional takes on some sort of jet suit - and surprisingly several real ones. Early German experiments started toward the end of WWII, but it wasn't until the late 50's that the idea became somewhat feasible.

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