One of the six simple machines, a screw is nothing more than an inclined plane wrapped around a center pole. While today screws come in standard sizes, and typically are tightened by turning clockwise (and loosened by turning counterclockwise), this is a recent invention. A great example of how things that seem simple can be really hard to do right, the development of the predicable system we enjoy today took 2,000 years to invent.
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