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TIL Peahens are sensitive to both visible and ultraviolet (UV) light, which is invisible to humans. They use this ability in mate selection by judging a male’s feathers; more reflective and symmetrical eyespots are preferred.

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meOo TIL “the last great tank battle of the 20th century” took place in the middle of nowhere in the Iraqi desert. Since there were no nearby towns or landmarks, the Battle of 73 Easting had to be named after its map coordinates.
mXAM TIL that in 1978 a Russian scientist was accidentally shot through the head by particle accelerator. He lived, but the shot side of this face is now paralyzed and does not age.
wrB6 TIL that IRA snipers killed about 200 British soldiers/policemen from 1971 to 1997, and even shot down army helicopters. A “Sniper at Work” sign warned soldiers of the danger.
4XaM6 TIL Knights who had pledged allegiance to the feudal host and had land were obliged to give 40 days’ service per year.
Z8Pga TIL the train schedule in Tokyo is so reliable that if they run more than 5 minutes late, they issue a note to passengers to prove to their employers that it was the train's fault they were late to work