Leon Theremin’s Musical Instrument Can Be Played Without Being Touched
Today is, thanks to a long-ago calendar change, one of two birthdays in 1896 of Leon Theremin. He invented a very unusual musical instrument that you play without touching it.
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Humans Have Their Fingerprints All Over The History Of Fingerprinting
Today is said to be the day in 1858 that a colonial magistrate in India began using fingerprints for identification. But that's just one part of the history of how and why our prints are such a valuable bit of biometric information today.