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Most people think of Hedy Lamarr as a glamorous movie
star from the 1930s and 1940s. However she was the holder of
a patent on which wireless data networking is based on
today.
She learned a lot about weaponry from her first husband
who was a weapons manufacturer in Germany. She left him when
he became involved with the Nazis. She then went to London,
then to Hollywood.
When World War II started, there was a problem of the
enemy blocking the signal for radio controlled missiles.
Hedy realized that if the signal jumped from frequency to
frequency quickly (like changing channels on a television
set) and both the sender and the receiver changed in the
same order, then the signal could not be blocked by the
enemy listening in who didn't know how the frequency was
changing.
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