the.com/gear
A tiny toothed circle that taught humanity how to multiply force without lifting a finger.
oldestGear trains date back over 2,000 years
antikytheraAncient Greeks geared a hand-cranked star computer
nature's gearA jumping insect has real meshing leg gears
golden ratioSome gear teeth use involute curves for smoothness
slang shiftGear means clothes, drugs, or equipment everywhere