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TIL during the Apollo 16 lunar mission in 1972, the crew brought a lunar rock first collected by Apollo 12 in 1969 BACK to the moon as part of a magnetic field experiment. The rock ended up travelling back and forth between moon and Earth twice.

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Bgl9d TIL A standard nickel in the U.S. contains only 1.25 grams of actual nickel. The remaining 3.75 grams is copper. Combined, the coin's metallic value averages 8-10 cents, nearly double its face value. It is illegal to melt down U.S. currency.
menE TIL There is a mental psychosis known as Jerusalem syndrome which is the phenomenon whereby a person who seems previously balanced and devoid of any signs of psychopathology becomes psychotic after arriving in Jerusalem.
OGZE1 TIL about 'Sexual Parasitism' in Anglerfish, where the male dwarf fish bites an adult female, latches on, fusing its tissues to the female host to eventually share one circulatory system. The male eventually withers away, and all that is left is its testes.
RjAl TIL that Simon wrote “The Sound of Silence” in his bathroom, where he turned off the lights to better concentrate. Then he’d play, in the dark, ‘Hello darkness, my old friend / I’ve come to talk with you again’.
xVdbk TIL about “The Harris’s List”, a catalogue from the 1700’s of all the prostitutes in London during that period, where you could find any sex workers’ address, price, age, skills, and it would rate their performance and describe their appearance. It was published annually for decades