To the best of our knowledge, the mechanical gear
This Insect Has The Only Mechanical Gears Ever Found in Nature | Surprising Science - 0 views
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evenly-sized teeth cut into two different rotating surfaces to lock them together as they turn
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was invented sometime around 300 B.C.E. by Greek mechanics who lived in Alexandria
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Young insect legs have real meshing gears | Zoology | Science News - 0 views
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Adults are bigger and heavier, Burrows says, so perhaps leg-to-leg friction syncs motions without the need for gear teeth.
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