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They have been measured to the millimeter, timed to the zeptosecond and asked what kind of forest animal they would be.

“Scientists have measured the shortest unit of time ever: the time it takes a light particle to cross a hydrogen molecule. That time, for the record, is 247 zeptoseconds. A zeptosecond is a trillionth of a billionth of a second, or a decimal point followed by 20 zeroes and a 1,” the news organization explained.

Please consider the newly discovered “zeptosecond,” the shortest unit of time ever measured.