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YoyosThe yo-yo is a toy which has its origins in ancient Greece. The modern version of the yoyo became popular in the 1920's.
A yoyo consists of two equally sized but not specifically equally weighted pieces of plastic, wood, or metal, connected with an axle, with a string looped around the axle. For using a yoyo, the finger is inserted into the loop at the end of the string, winding the string around the axle and throwing the yo-yo down so that it unwinds the string.
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