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TIL of Angel’s Glow, a condition observed in soldiers at the Battle of Shiloh, when their wounds began to glow blue and heal faster. In 2001, a 17yo discovered it was caused by nematode vomit, the beneficial bacterium Photorhabdus luminescens.

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W7v9N TIL that feeding deer too much deer corn is catastrophic for their health. It encourages the build-up of acid in the hooves, called laminitis. This acid is painful when the deer walk, so they lean on the other hooves. Since the hooves aren't properly getting worn down from walking, they grow!
NXB7J TIL in 2019, the UK granted asylum to a 14-year-old boy and admitted him to a local high school. He was asking 14yo girls out and changing with 14yo boys in PE. It later turned out he was actually an adult who was wanted for murder in Serbia.
xVOYk TIL that the PEPFAR program, started by Pres. Bush, is credited with saving the lives of 17 million people living with HIV
WkGZ8 TIL that VISA obtained a patent in November 2019 to convert US money into a digital currency controlled by central bank
wj11 TIL that until 1953, NYC had a pneumatic tube mail network that spanned 27 miles and connected 23 post offices. At its peak, the system moved 95,000 letters a day.