Today in 20th century tech history
February 4
In 1936: Radium E becomes the first radioactive element to be made synthetically, by J. J. Livingood at the University of California.
In 1957: USS Nautilus, the first nuclear-powered submarine, logs her 60,000th nautical mile, matching the endurance of the fictional Nautilus described in Jules Verne's novel " 20,000 Leagues Under the Sea".
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