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This touchless gear system uses fluid dynamics to transfer power and rotation without any teeth

From the chariot wheels crossing the Gobi Desert in 3,000 BCE to the intricate bronze clockwork of the Antikythera mechanism ...
New Atlas

How it works: The wobbly but precise high-torque Harmonic Drive gear

The Harmonic Drive is a key part of countless robotic applications. Incredibly simple yet quite odd to watch, this gear system is extremely precise with an impressive torque-to-weight ratio, even if ...