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TIL the Theremin was invented by a Soviet scientist when he added a sonic element to his gas density analyzer. It is the only musical instrument that is played without touching it.

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yWgw TIL there is an island in the Pacific of 300 people, no longer than 750m, where a Polynesian people live at a population density equalling that of Bangladesh. The fact that the island’s ecosystem hasn’t been negatively impacted has attracted the attention of sustainability scientists.
ZxRp TIL there is a $2 millon Leica Lens owned by a guy in Qatar. Apparently it rocks, but no photos have ever been published to prove its ability.
NXblP TIL before 1804, the office of the US vice-president was awarded to runner up to the presidential race
mxl9x TIL that Japan has blue traffic lights in some areas because historically the Japanese used the same word for green and blue.
yQKal TIL Mr. Rogers was a lifelong vegetarian because he didn't "want to eat anything that has a mother"