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On New Year's Eve 2016, the world's timekeepers will extend the year by exactly one extra second. Official clocks will hit 23:59:59 as usual, but then they'll say 23:59:60, before rolling over into 2017. This is known as a "leap second," and timekeepers slip them in periodically to keep our clocks in sync with the Earth's rotation. [Source: Vox]
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