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TIL cats can't be vegan or vegetarian. They are obligate carnivores, meaning their anatomy and physiology are designed to get the nutrients they need from animal tissues, not from plants.

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nJ4G TIL that there were only two black combat pilots in the First World War. Eugene Bullard was an African-American who served with the French Air Force and Ahmet Ali Çelikten, an Arab-African who flew with the Ottoman Air Force… placing them both on opposite sides of the conflict.
W7EMA TIL that the “Mozart Effect" (the claim that "listening to Mozart makes you smarter" or that early childhood exposure to classical music has a beneficial effect on mental development) stems from a single published in the Nature journal in 1993. The results were highly exaggerated by the press.
wLXO6 TIL Amish men shave their mustaches as a protest against violence. The Amish were originally founded in Europe. At the time, mustaches were prevalent in the German military. The Amish began shaving their mustaches as a physical representation of their non-violent nature. It continues today.
exBE TIL If you denounce a Mexican drug cartel on social media they might kill you.
P7ne TIL there was a woman who survived a gas chamber, three Nazi concentration camps, testing by the infamous Nazi Doctor Josef Mengele, a death march, and shared a barracks with the dying Dutch teenager Anne Frank.