Leap Second
Wow, New Years Eve is going to last a whole second longer!New Year 'delayed' by leap second
There have been 22 leap seconds since 1972.
Scientists are delaying the start of the new year by adding the first "leap second" in seven years.
The Paris Observatory said an extra second would be added to clocks worldwide at the stroke of midnight on 31 December.
Leap seconds are required every so often to keep our clocks in sync with solar time used by astronomers.
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