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TIL that the human fingertip can feel the difference between a smooth surface and one with a pattern embedded just 13 nm deep

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7PL7 TIL McDonald’s is no longer the world’s largest restaurant chain - Subway now has more outlets open worldwide than McDonald’s.
OVRX TIL failed McDonalds products include the McPizza, McHotdog, a vegetarian pineapple patty burger called McHula, McSpaghetti and the McLobster
yxNp TIL: A quarter of the world’s hazelnut supply is used to make Nutella
rRd7M TIL that the world's first mental health hospital was built in Baghdad, Iraq in 705 AD. While mental health patients were being condemned, punished, and even burned in Europe, 8th and 9th century mental health patients in Iraq, Egypt, and Syria were given more proper hospitalization and treatment.
kJ7ym TIL during WW2, in order to prevent the Nazi’s from turning it into a base for U-Boats, The British invaded Iceland. There was only one casualty, a Royal Marine who committed suicide en route