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God invented gears before any engineer could ponder the idea.
The first mechanical gears found on a living organism are located on the hind legs of the nymph stage of the leafhopper. Leafhoppers can jump at a speed of up to 9 miles per hour, which requires precision in the take off. Both legs must push off at exactly the same time, otherwise the nymph leafhopper will spin out of control. Since nerve impulses can’t travel fast enought to accomplish this, how does the leafhopper keep it together?
God created tiny curved gears between the animal’s legs. When one leg begins to move, the other is caught by the gear and forced to move in unison. A perfect design from a perfect creator.
Source: (2014). Gear up. Answers Magazine, 9(1), p. 13.