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TIL Daylight Saving Time (DST) was first used in 1908 in Port Arthur, Ontario (today's Thunder Bay). While Germany and Austria were the first countries to use DST in 1916, a few hundred Canadians beat the German Empire by eight years.

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6E0RQ TIL TV executive Fred Silverman got the inspiration for Scooby-Doo's name from Frank Sinatra's hit song "Strangers In The Night." The syllables "doo-be-doo-be-doo" can be heard at the end of the song. Silverman used Sinatra's improvisation to help name the cartoon canine.
e0676 TIL that George Orwell had trouble getting Animal Farm published due to Soviet-British relations during WW2. Once, a publisher agreed to release the novella but later reneged after warning from an officer at the British Ministry of Information. The officer was soon discovered to be a Soviet spy.
RZV8 TIL of a monk who had taken an old book written by Archimedes, erased the contents, and wrote over it with prayers. Scientists have determined that that monk erased a previously unknown book by Archimedes, that laid out the foundations of Calculus thousands of years before Newton and Leibniz.
jNoya TIL Clyde Tombaugh, the man who discovered Pluto, has finally visited it, as his ashes are aboard the New Horizons spacecraft that completed a Pluto flyby in 2015.
OGolY TIL that photoelectric cells (which effect explained by Einstein) switched the lights on during the exposition of Chicago from 1833. They were activated from photons coming from Acturus star ; those took 40 years to land there and were released from the star during the previous exposition