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I once saw a guy coming out of a Physics lecture carrying an approximately one-foot-long piece of straight coat-hangar wire. He said the professor gave one to each member of the class. It was the length of one light-nanosecond, the distance traveled by a beam of light in vacuum in one billionth of a second (a thousandth of a millionth of a second for UK readers).
I once saw a guy coming out of a Physics lecture carrying an approximately one-foot-long piece of straight coat-hangar wire. He said the professor gave one to each member of the class. It was the length of one light-nanosecond, the distance traveled by a beam of light in vacuum in one billionth of a second (a thousandth of a millionth of a second for UK readers).