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TIL modern mathematical notation for fractions that seperates the numerators and denominators with bars were invented by the 12th century Moroccan mathematican Abu bakr Al hassar

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wPro TIL that in Rome the ruins of Pompey’s Theatre (the temple where Julius Caesar was assassinated) is now a protected cat sanctuary. This important historical site is now a no-kill zone for various breeds of cats to live peacefully
KYZv4 TIL the most abundant bird in the world is the Red-Billed Quelea, there is an estimated 1.2 billion in the world with flocks in the millions.
750P TIL that when the Nazis forced Jews to wear yellow stars during WW2, it backfired. Doing so increased sympathy for the Jews, who were (contrary to Nazi propaganda) obviously not responsible for how badly the war was going. People began tipping hats to Jews as a symbol of anti-German resistance.
LkMxv TIL the average dog can count to 5 and understands about 165 words, including signs, signals and gestures. The smartest dogs understand up to 250 words, putting them on par intellectually with 2-and-a-half-year-old humans.
78pOL TIL, Operation Paperclip was a secret United States intelligence program in which more than 1,600 German scientists, engineers, and technicians were taken from the former Nazi Germany to the U.S. for government employment after the end of World War II in Europe, between 1945 and 1959.