Kids have been playing with it for generations, but did you know that Play-Doh wasn’t originally meant for playing? Lifestyle expert Barbara Majeski says it was actually invented to clean soot off of wall paper. “Once wallpaper became vinyl they had to find another use for Play-Doh,” she says. It’s one of many surprising facts she has up her sleeve. She also says YouTube was originally meant to be a dating site when it kicked off in 2005 with a video of one of its founders at a zoo.