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6EyL7 TIL of U-505, a Type IXC U-boat, that was attacked and successfully captured by a Hunter-Killer task group in 1944. Towed to Bermuda, the submarine was brought to Chicago, Illinois where it was restored and placed on display in the Chicago Museum of Science and Industry.
rXw1 TIL Leonardo da Vinci used “mirror writing” (from right side of page to left) for his personal and private notes. This helped prevent others from stealing his ideas, protected his scientific theories from scrutinization by the Roman Catholic Church, and as a left-hander, also eliminated smudging.
MrKK TIL when religion was suppressed in Soviet Russia, Santa/St. Nick was replaced with Grandfather Frost, called the spirit of winter, who brought gifts on New Year’s and placed them under the “New Year tree”