The yo-yo is a toy consisting of two equally-sized discs of plastic, wood, or metal, connected with an axle, around which string is wound. There is a slip knot at the free end of the string, and, on a properly strung yo-yo, an uncut loop around the axle end which allows it to spin freely, or "sleep" upon reaching the string's end.
It is played by tying the string's free end around the middle finger, grasping the yo-yo, and then throwing it downwards with a smooth motion. As the axle spins within the loop, a gyroscopic effect occurs, permitting time to perform a number of movements. By flicking the wrist, the yo-yo can be made to return to the player's hand, with the cord again completely wound into the groove. Any movement, or combination of movements, which result in the return of the yo-yo to the player's hand in this fashion is considered a trick.
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