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TIL under the care of the unconventional Dr. Theodor Morell, from 1936 to 1945 Adolf Hitler was administered 74 different medical substances (in 28 different mixtures) for various ailments, including an injection of methamphetamine to fight grogginess.

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BgVvk TIL that Idaho is a made up word, not derived from the Shoshone language.
ep0r5 TIL about the Shepard Tone. An audio illusion that creates the feeling of consistent, never-ending rising/falling. The illusion is achieved by playing overlapping notes that are one octave apart. In this way, the sensation of rising or descending notes never ends.
aERo TIL in 2008 the makers of square-shaped Shreddies breakfast cereal ran an ad campaign promoting their ‘new’ diamond-shaped version. Sales increased by 18%.
8eJ6G TIL of Jan Janský, who independently discovered the blood groups I, II, III, and IV (corresponding to modern O, A, B, and AB)
YmlA TIL John Cena holds the record for wishes granted with the Make-A-Wish foundation by any celebrity at over 400