A man named Joe McVicker invented a non-toxic doughy wallpaper cleaner in the early 1950's. In 1955, his sister-in-law, who was a teacher, complained to him that there wasn't a good modeling clay for her elementary students. Joe sent over some of his wallpaper cleaner and it was a hit with the kids. Play-Doh was born!
As a result, we've all been playing with the stuff for over 50 years. And McVicker became an accidental millionaire by age 27!
And the best part: if you have stained wallpaper, some white Play-Doh might do the trick!