The easiest way to describe the size of a nanometer is by comparison. If a baseball is a nanometer, the whole earth would be a meter. A meter is 39 inches and a yard is 36 inches.
The Wilson Double Core tennis ball, the official ball of the Davis Cup tournament, has clay nanoparticles embedded in the polymer lining of its inner wall, which slows the escape of air from the ball, making it last twice as long.
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