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Electric Unicycle Is A Tumblebug
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Whenever I see these little self-balancing wheel personal transportation devices, I am reminded of Robert Heinein's 1940 classic The Roads Must Roll and the wonderful tumblebug:
Gaines and Harvey mounted tumblebugs, and kept abreast of the Cadet Captain, some twenty-five yards behind the leading wave. It had been a long time since the Chief Engineer had ridden one of these silly-looking little vehicles, and he felt awkward. A tumblebug does not give a man dignity, since it is about the size and shape of a kitchen stool, gyro-stabilized on a single wheel.
(Read more about Robert Heinlein's Tumblebug.)
(Heinlein tumblebug from Astounding SF June 1940)
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