The document summarizes the history and fun facts of Play-Doh. In 1955, a teacher asked Joseph McVicker about a safe modeling clay substitute, and he sent her a non-toxic wallpaper cleaning compound, which became a hit. The McVicker brothers then formed Rainbow Crafts Co. to produce and sell Play-Doh. Over the decades, various companies like Kenner Products and Hasbro acquired Rainbow Crafts and the Play-Doh brand. Today, Play-Doh remains a leader in reusable modeling compounds and is sold worldwide, with over 2 billion cans sold since 1956.