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TIL rather than using a mirror, some observatory telescopes were built to use a large, spinning pool of liquid metal as a reflecting surface

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mx7KM TIL an Ancient Greek city in northern Afghanistan was rediscovered in the 1960s
R68w TIL The Church of Satan does not worship or even believe in the existence of Satan
DdXD TIL Alfred Hitchcock’s Psycho was the first American film to show a toilet flushing.
vPEx4 TIL that in 1992 the US Postal service held a vote over whether official stamp of Elvis Presley should depict Elvis as a young man or later in life. After over 1.2 million ballots, young Elvis won with 75% of the vote, and would become one of the most popular commemorative stamps of all time.
gJQA TIL that Queen Elizabeth II had to use ration coupons to buy the material for her wedding gown