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Today I learned upside-down rainbows exist; they are named circumzenithal arcs and are considered halos. Arcs are caused by the refraction of sunlight through ice crystals, generally in cirrus or cirrosts clouds, rather than from raindrops like regular rainbows.

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eprw5 TIL the worlds fastest ant is the Sarah’s Silver Ant and can run at 3.7kmph which is faster than most humans walk! If it were human sized it would do 300m/s
Y7mLd TIL in 1938, Chiang Kai-Shek caused the deadliest manmade flood in history when he intentionally broke the Yellow River dam. While he did succeed in his goal of slowing down the Japanese advance, it ended up killing 400,000-893,303 people in the process.
yVLpp TIL about the Bannister Effect: When a barrier previously thought to be unachievable is broken, a mental shift happens enabling many others to break past it (named after the man who broke the 4 minute mile)
wL1yP TIL of John II of France, who was captured by the English, in the Hundred Years War, and held hostage in London. An exchange of hostages occurred, with his son, Louis, taking his place. When John II was informed that Louis had escaped from captivity, he voluntarily returned to England as a hostage.
W5A4 TIL during the Manhattan Project, a production race was held between two calutrons, one run by “hillbilly” girls and the other run by Ph.Ds. The girls won the contest because “the scientists could not refrain from time-consuming investigation of the cause of even minor fluctuations of the dials”