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TIL that if you took a tablespoon of the matter that a neutron star is composed of it would weigh around 1 billion tons (900 billion kg), which is approximately the weight of Mt. Everest from base to summit.

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xVOk0 TIL of the Ceremony of the Keys which is carried out every night at exactly 9:53 pm at the Tower of London and is believed to be the oldest military ceremony in the world. Originating in the Middle Ages it has never once been cancelled though it was delayed once during WWII due to enemy action.
Br84D TIL about Juan Pujol García, a double agent who tricked German leaders about the date and location of the invasion of Normandy which lead to its success. He was notable for having received distinction from both sides; the Iron Cross from the Nazis and membership of the Order of the British Empire
pBPG TIL that the place in the United States with the longest name is Lake Chargoggagoggmanchauggagoggchaubunagungamaugg, located near Webster, Massachusetts.
rMQw TIL in Victorian London it was theorized that diseases like Cholera (which killed tens of thousands) were spread by bad-smelling air, until a scientist named Jon Snow determined water was the culprit - he became known as the father of modern epidemiology.
r99x TIL that in 1963, the manager of Hall of Fame pitcher, Gaylord Perry, said jokingly, “They’ll put a man on the moon before he hits a home run.” Sure enough, on July 20, 1969, Perry hit his first career home run, just an hour after Apollo 11 landed on the moon.