'We do not know how to cope': Earth spinning slower may prom

The Earth has rotated slowly enough to require a first ever negative leap second, according to a report published in Nature.

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United States , Felicitas Arias , Elizabeth Donley , Christian Bizouard , Duncan Agnew , Reference Systems Service , Us National Institute Of Standards , United States Navy , International Bureau Of Weights , International Earth Rotation , Time Department , International Bureau , Coordinated Universal Time , Leap Second , Atomic Clocks ,