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TIL that the decibel (dB) scale is logarithmic instead of linear. The difference between a rock band and an airplane taking off is only about 10dB.

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XEjMX TIL: Only one man was uniquely present at (and witness to) all three of the first nuclear detonations. The Trinity Nuclear Test and the Hiroshima as well as the Nagasaki detonations. Scientist: Lawrence H. 'Larry' Johnston.
nd9d TIL: Witches are depicted as flying on brooms, because in the Middle Ages, people used a broom handle to vaginally inject a liquid concoction of hallucinogenic plants which would cause the “witches” to imagine they were flying.
6EvQJ TIL that ketchup was origionally not made with tomatoes and that there are still mutiple kinds of ketchup, including walnut, mushroom, mango, and banana ketchup still sold today.
Gw6g TIL in “Hey Jude” by The Beatles Paul McCartney messes up and says “fucking hell!” It’s audible in most versions.
Oodwa TIL that Smokey Bear's name was inspired by "Smokey" Joe Martin, a New York firefighter who suffered burns and blindness during a 1922 rescue. Also, the symbol of the U.S. Forest Service is actually just "Smokey Bear," not "Smoke the Bear." The "the" was added to help the rhythm of a 1952 song.