The reason why hair turns gray as we age is because the pigment cells in the hair follicle start to die, which is responsible for producing "melanin" which gives the hair colour.

The Pentagon has twice as many restrooms as necessary. When it was built, segregation was still in place in Virginia, so separate restrooms for blacks and whites were required by law.

Ohio is the only U.S. state that does not have a rectangular flag.

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