Born in Austria as Hedwig Eva Maria Kiesler,
Hedy Lamarr was an A list actress in the 1930s and
40s, and was billed as the most beautiful woman in the world.
She and a co-inventor also concieved of a way to control torpedoes by a constantly changing radio frequency so that it could not be jammed. The shortcoming of radio controlled torpedoes was that the control signal could be jammed on any particular frequency. Ms. Larmar and her partner thought of the way to get around a jamming signal, by having the controller and the receiver in the torpedo change frequency in unison and continually, so the signal could not be jammed. The controller and the receiver on the torpedo would change frequency at predetermined times, to predetermined frequencies so that a jamming signal could not follow the sequence. The exact configuration of coordinating the frequency changes that Lamarr came up with was not used, but the idea of frequency changing is used in many technologies today.
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