Hedy Lamarr - Hollywood glamour girl, "most beautiful woman in Europe". Also co-invented an early technique for spread spectrum communications and frequency hopping, necessary to wireless communication from the pre-computer age to the present day.
Hedy Lamarr was called the "most beautiful woman in the world" in her day. But what most don't know is that she had the brains to match her beauty, she invented "spread spectrum communications" and "frequency hopping". The U.S. Navy eventually applied this technology to radios used during the Cuban Missile Crisis, and it went on to shape modern technologies such as GPS, Bluetooth in headsets and phones, and U.S. military guided missiles.