The Ups and Downs of Yo-Yo's

The Yo-Yo, a weapon used in South Pacific cultures, has been traced back to the ancient Greeks. First patented in 1866 by James L. Haven and Charles Hettrich, the Yo-Yo has enjoyed periods of popularity for generations with kids from 1 - 100. Donald Duncan was the marketing genius responsible for the first American Yo-Yo fad of the 1930's. He also marketed the first successful parking meter. At one time, Lego Co. used unsold Yo-Yo's as wheels on toy trucks. In 1962, the most recent period of popularity, Duncan sold 45 million of the toy