Hedy Lamarr was a screen legend known as 'the most beautiful woman in the world,' but she was also a brilliant inventor. During WWII, she co-invented a 'Secret Communications System' to help Allied torpedoes avoid radio jamming. The inspiration for this invention came from the player piano. Lamarr and co-inventor George Antheil used the idea of the perforated paper rolls used in player pianos to synchronize the 'frequency hopping' between the torpedo and the controller. By hopping across 88 different frequencies (the same number as piano keys), the signal became impossible to jam. While the Navy didn't use it immediately, her invention eventually became the foundation for modern Bluetooth and Wi-Fi technology. Lamarr is a rare legend whose legacy is tied both to the silver screen and to the musical instrument that helped her change the world.