Pinterest Facebook Twitter Email The Invention of Play-Doh 02:51 A nursery school teacher realizes that wallpaper cleaner can be used as a toy. From: Don Wildman, Mysteries at the Museum and The Conqueror's Curse, Play-Doh, Poe Murder Similar Topics: History Travel's Best Related Videos The Bombing of the Thinker 02:44 Meet Balto, Hero Sled Dog 03:17 Tour the Air Force Museum 01:18 Chimp Conquers Outer Space 02:35 Cannibalism in the Arctic 03:54 The Coney Island Sideshow 02:21 The Invention of Chewing Gum 03:02 The Pretty Boy Floyd Mystery 02:22 More Videos The Find of the Century 02:46 The Midnight Express' Savior 03:16 Building the Spruce Goose 01:21 Archiving the War on Drugs 02:16 Evidence at the Mothman Museum 03:05 The Secret to Houdini's Tricks 02:27 Bell of the Edmund Fitzgerald 02:47 Black Market Spirits 03:06 California 'Venus' Shot Dead 02:25 Crash at Area 51 01:59 Inside Capone's Haunted Cell 02:37 See Shrunken Human Heads 04:00 Excavating Ice Age Fossils 02:59 Was Marilyn Monroe Murdered? 02:16 USS Intrepid: Floating Museum 02:25 Theremin's Amazing Invention 01:13 We Recommend 50 of the Most Charming Small Towns in America 50 Photos This Majorly Discounted CityPASS Will Let You Visit 5 of Seattle’s Best Attractions for a Fraction of the Cost 50 States, 50 Landmarks 50 Photos Prison Tours America's Best Dinosaur Exhibits Wonders of the West 10 Photos