GameboyRMH writes: A gear mechanism has been discovered for the first time in nature in the nymph of the Issus, a small plant-hopping insect common in Europe. It uses the gears to synchronize the movement and power of its hind legs, forcing the legs to propel it in a straight line when jumping, which would otherwise be impossible for the insect if it had to control the timing and force of its leg muscles independently. The journal paper is paywalled but you can read a summary at phys.org.
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