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TIL one of the last types of steam locomotive was maintained while the boiler was still in steam, by men in asbestos clothes entering the 220°F firebox and repairing the engine, while it was still under pressure. This was done to reduce downtime and allow a 6-day-a-week schedule.

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ZpKL4 TIL In his original concept drawings for Oscar the Grouch, creator Jim Henson imagined a magenta monster. Due to the limitations of early color television, Oscar was redesigned with orange fur for his premiere on the first season of Sesame Street in 1969, and changed to green for the second season.
BgEle TIL that there is a mountain in Wyoming that was formed by a 500-square mile rockslide 50 million years ago. The slide traveled 25 miles in about 30 minutes and may moved like a giant hovercraft as the result of volcanic activity breaking limestone down into carbon dioxide gas
Wkapd TIL Hugh Hefner Playboy mansion had secret underground tunnels that lead to certain Hollywood celebrities homes. Let's talk about it. The 1970s were the decade to be invited to the Playboy Mansion, and it seems some stars wanted easy access.
wow18 TIL about the Our Lady of Angels School Fire. A Catholic school in Chicago burned down in 1958, killing 92 students and 3 nuns.
GA1d4 TIL that in 1930, Vivien Thomas, an African American carpenter’s apprentice who didn’t go to Medical School, a long side Dr Alfred Blalock successfully devised an operation to save “Blue Babies”, infants born with a deadly heart defect that sends blood past their lungs