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"But the problem with reincarnation is that it's hard to imagine what the storage medium for past lives would be. Not to mention the input-output device. I hesitate to rule it out completely, but I'd need pretty definite proof."
- Arthur C. Clarke

Gyro Two-Wheeled Truck  
  A gyroscopically-stabilized truck with just two wheels.  

Now Alexander saw that the two-wheeled truck was still waiting, backed up to the loading platform...

The Gyro was one of the air-driven Robling types, very simple, vey reliable, the flywheel driven by a tiny stream of air impinging on the peripheral turbine blades. Once it was in motion, very little air was needed to keep the heavy rotor turning at a high enough velocity to stabilize tha truck.

From The Sign of the Tiger, by Alan Nourse (w/Meyer).
Published by Amazing Science Fiction Stories in 1958
Additional resources -

Compare to the tumblebugs from Robert Heinlein's 1940 novella The Roads Must Roll.

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  More Ideas and Technology from The Sign of the Tiger
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