Hollywood called her the most beautiful woman in the world, but her best work never made it to the screen.
A movie star and a composer wanted to keep enemy radio from jamming torpedoes. Which self-playing musical instrument gave them the idea?
Player pianos
Composer George Antheil had once synced several player pianos for a wild avant-garde score, and he and Hedy Lamarr realized radio signals could hop between frequencies in the same coordinated way.