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TIL that until 1992, the UK had a nuclear attack early warning siren code that, until the early 1960's, included the use of church bells to signify impending fallout.

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696NQ TIL allodynia is a term for feeling pain or heightened sensitivity during activities where there typically isn't, such as brushing your hair or gentle pressure of the skin. It usually presents as a symptom of various nerve-related conditions, such as fibromyalgia, multiple sclerosis or migraines.
nWLkG TIL that for decades there was speculation why "Dolly for Sue", a seemingly normal rag doll, was present on the Island of Misfit Toys in the Rudolph the Red-Nosed Reindeer special. In 2007, Arthur Rankin revealed that she was a Misfit Toy due to being clinically depressed.
VBO5Z TIL that in 1856 the U.S army bought camels, and in 1862 the confederate army captured "Douglas the camel", he served a year before he was shot, or most likely eaten.
VMlxB TIL that 90% of the coal we use today only exists because 300 million years ago, microbes that could ingest wood, did not exist, so trees would fall on top of each other, and the weight of all that heavy wood, over millions of years, would compress those trees into peat and then, into coal.
Qpg9 TIL A cat named Toldo has been visiting the cemetery and leaving gifts of affection on the grave of his deceased owner for over a year.