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Before the eraser, bread was used to remove pencil marks.
During Germany’s hyperinflation that peaked in 1923, a loaf of bread cost 428 billion marks and a kilo of butter would run you roughly 6 trillion.
Cheetahs have “tear marks” that run from the inside corners of their eyes down to the outside edges of their mouth. These marks help reflect the glare of the sun when they are hunting during the day. They work just like the black marks that football players put under their eyes during the games. These marks also work like the sights on a rifle, to help the cheetah “aim” and stay focused on their prey when they are hunting.