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TIL the Grand Canyon is listed at just 7th in the world on a list of "greatest ravines".

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16oXd TIL a sufragette once followed Winston Churchill everywhere he went and rang a bell every time he tried to speak in public.
oBMk8 TIL the physicians of King George V administered fatal doses of morphine and cocaine so that his death would be reported in the morning newspaper edition, rather than the "less appropriate... evening journals."
QJM9a TIL that Andrew Carnegie and John D. Rockefeller, two wealthy extremely entrepreneurs, sent each other gag Christmas gifts. Rockefeller sent Carnegie a cardboard vest to make fun of his poor childhood. In return Carnegie sent a fine whiskey to Rockefeller, a devout baptist who had given up drinking.
WkxVN TIL that since projectors cannot project the color black, they rely on an optical illusion using the darkness of a room to give the illusion of the color black.
b6yyp TIL that the Manhattan Project produced a short book on how to build an atomic bomb. "The Los Alamos Primer" is 24 pages and completely declassified. Freeman Dyson wrote that the guide should not have been published, because it tells readers that "bomb designing is fun".