Yo-Yo

The yo-yo is a popular toy consisting of a length of string tied at one end to a flat spool. It is played by holding the free end of the string (usually by inserting one finger in a slip knot) and pulling at it so as to cause the spool to turn whilst suspended in mid-air, either taking up or releasing the string. First made popular in the 1920s, yo-yoing is still very much enjoyed by both children and adults, though it was originally made as a children's toy.

In the simplest play, the string is initially wound on the spool by hand; the yo-yo is then thrown downwards so that it first descends unwinding the string, then (by inertia) climbs back winding it up; and finally the yo-yo is grabbed, ready to be thrown again. Many other trick plays exist, most based on the basic sleeper trick.One of the most famous tricks on the yoyo is "walk the dog". This is done by throwing a strong sleeper and allowing the yoyo to roll across the floor.