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TIL that the Mayan people constructed the temples in a way that a handclap at the base of the temple produces an echo that sounds like the call of the sacred Quetzal bird. For them the bird was a messenger of the gods.

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1WMO TIL The atomic bomb dropped on Nagasaki, Japan was intended for Kokura, but the pilot’s view of the target in Kokura was obscured by a cloud.
mx8Jp TIL of the law of urination, it states that all mammals take roughly 21 seconds to empty their bladders regardless of size
QJ8y6 TIL that Geoffrey Tandy, a cryptogamist (algae specialist) who was mistakenly hired by Bletchley Park, significantly contributed to breaking the Enigma cipher, utilising his expertise to preserve otherwise unsalvageable codebooks from a torpedoed U-boat
EYNx TIL Benjamin Harrison, the 23rd president of the U.S., was the first president to have electricity in the White House, but wouldn’t touch the switch because he was too scared of being electrocuted.
VMKW4 TIL Of the metronome of Leningrad. During the Nazi siege of the city they installed 1,500 loudspeakers that constantly played the sound of a metronome. A slow rhythm meant safety and a fast rhythm warned of an air attack.