She was glamorous, for sure, but not stupid. Despite being considered one of the most beautiful screen actresses of her day--she appeared in a string of MGM hits during the 1940s--the Viennese-born Hollywood leading lady Hedy Lamarr (1914-2000) rejected the life of movie star in the 1950s.
At the beginning of World War II--as her biographer Stephen Michael Shearer has revealed --"Lamarr and composer George Antheil developed a radio guidance system for Allied torpedoes, which used spread spectrum and frequency-hopping technology to defeat the threat of jamming by the Axis powers. Though the US Navy did not adopt the technology until the 1960s, the principles of their work are now incorporated into modern Wi-Fi, CDMA and Bluetooth technology, and this work led to their being inducted into the National Inventors Hall of Fame in 2014." (Wikipedia)