And if it’s so simple, why wasn’t this invented a long time ago?
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The gyroscopes in these contraptions aren’t what keep them straight. What they do is produce a small force when they’re tilted which is detected by a sensor. A computer inside the device then uses that information to tell the motors to correct for the tilt. The processing power needed to make that work had already been around for a few years but it still needed someone to come up with the idea and give it robust enough programming to make it work.
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