"What television does is rent us friends and relatives who are quite satisfactory. This is quite something, to rent artificial friends and relatives right inside the house."
In this excerpt, the unthinkable has happened; the rolling roads have been sabotaged. Chief Engineer Gaines assembles his maintenance cadets and sets out to inspect and repair the damage.
Here's what they thought it would look like in 1940:
(Heinlein tumblebug from Astounding SF June 1940)
The oddest thing about a tumblebug is that it relies on "gyro-stabilization" the way we normally rely on two wheels. The Segway, a two-wheeled conveyance, similarly relies on gyro-stabilization.
Be sure to see how a modern company has created a monocycle concept vehicle similar to the tumblebug: read EMBRIO Embodies the Tumblebug. Closer yet, read about the Eunicycle Gyro-Stabilized Single Wheel Scooter.
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'... filling their great tanks with the finely divided dust which the ionic rockets would spit out in electrified jets.'
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'In the napcap a client became an instant yoga master...'
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'Jeremiah is a sports-model to begin with and that kind is awfully hot-tempered.'
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'They exist in loose swarms...'
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'If anything can glue the asteroids back into the planet they once were, magnology will do it.'
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A cooling unit had to be strapped to every commuter's back, by law.
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'...lined with durite, that strange close-packed laboratory product.'
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'He was still roaring when the knife missile flicked past him...'
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