Play-Doh

Early driving was risky—rumble seats, built-in cigarette lighters and fire-prone cars made even short trips dangerous.

In 1803 Italy, a scientist tests the idea that the body runs on electricity using an executed prisoner, sparking eerie questions about reanimation.

Remember when playtime meant tempting fate? From toy belts that fired speeding projectiles to high-powered pogo sticks that sent us soaring, these perilous playthings were made for kids—but their risks were anything but child’s play.

Many everyday tools—from zippers to Super Glue to computers—originated as military inventions.