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Better speedometer

Design and market a speedometer for vehicles of all kinds, based on the fraction of the speed of light at which the vehicle is moving. Or persuade the private market to do it. An aftermarket add-on could be popular among car enthusiasts, and it could be introduced as an item in the luxury car and electric car markets. At first, prototypes could be simply scaled ordinary speedometers based on wheel rotation rates. ...more »

Submitted by (@mikel137)

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