Hedy Lamarr developed frequency-hopping, the forerunner of spread-spectrum communications used in WiFi, GPS, and Bluetooth, to control torpedoes in a way that a

Hedy Lamarr developed frequency-hopping, the forerunner of spread-spectrum communications used in WiFi, GPS, and Bluetooth, to control torpedoes in a way that avoided jamming by the Nazis, from her understanding of George Antheil's symphonic use of pianola rolls to synchronise multiple player pianos. https://www.wired.com/2011/08/0811hedy-lamar-george-antheil-torpedo-patent/ https://www.wired.com/2011/08/0811hedy-lamar-george-antheil-...