A fresh, intriguing look at the stories behind great toy inventions, by Don Wulffson and illustrated by Laurie Keller. "Originally, Play-Doh only came in white. There's a good reason for this. You see, Play-Doh didn't start out as a toy. It started out as a product for cleaning wallpaper." Have you ever wondered who invented Lego, Mr. Potato Head, or toy trains? Here are the fascinating s…