Unexpected Inventions

1. Play-Doh
One smell most people remember from childhood is the odor of Play-Doh, the brightly colored, nontoxic-modeling clay. Play-Doh was accidentally invented in 1955 by Joseph and Noah McVicker while trying to make a wallpaper cleaner. It was marketed a year later by toy manufacturer Rainbow Crafts. More than 700 million pounds of Play-Doh have sold since then, but the recipe remains a secret.

2. Fireworks
Fireworks originated in China some 2,000 years ago, and legend has it that they were accidentally invented by a cook who mixed together charcoal, sulfur, and saltpeter -- all items commonly found in kitchens in those days. The mixture burned and when compressed in a bamboo tube, it exploded. There’s no record of whether it was the cook’s last day on the job.