Bounce back to the carefree childhood days when you spent hours with your yo-yo learning to walk the dog or go around the world . Yo-yos of many companies decades (from the 1930s onward) and designs are displayed along with yo-yos that shriek whistle and spark. Whether you prefer wood or plastic butterflies or teenies Duncans or Whirl Kings here you will find the yo-yos that you like best in over 275 color photographs. Also yo-yo championship patches tricks books and trophies are displayed. Brief histories of several yo-yo companies such as Cheerio Duncan and Royal are provided. Methods are explored for roughly determining a yo-yo s age through inscribed zip codes and patent numbers. Current market values for each and every yo-yo are found in the captions.