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TIL that Humans and the Tree Shrew are the only known mammals that like spicy food.

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D1Ejj TIL about the polio epidemic of August 1952 in Copenhagen, Denmark. This epidemic ushered in the widespread use of positive-pressure ventilation, replacing the negative-pressure iron lung machine. It is also during this time that the concept of an intensive-care unit (ICU) was first introduced.
W77v8 TIL that on May 25, 1979 American Airlines Flight 191 crashed into an open field after the plane engine fell off during take off. This caused the plane to rotate left and fly sideways until it plunged to the ground. With 273 fatalities, it is the deadliest aviation accident in U.S. History.
lo4JA TIL the Carrington Event was a coronal mass ejection that occurred on August 28, 1859, causing Aurorae for days as far south as Cuba and bright enough to read by, as well as disabling the telegraph systems of North America and Europe.
grO77 TIL, the reason you hold your hand up in court when you take the oath is that centuries ago, criminals were branded on the hand. Different letters were used in England, F for Liar, T for Thief, F for Fugitives, R for Rogue, V for Vagabond, and P for Perjury.
xVOk0 TIL of the Ceremony of the Keys which is carried out every night at exactly 9:53 pm at the Tower of London and is believed to be the oldest military ceremony in the world. Originating in the Middle Ages it has never once been cancelled though it was delayed once during WWII due to enemy action.