Leap Seconds
Why? Here is the history of time measurement based on the Cesium atom and why it is necessary to insert (or remove) a second from our time keeping to stay in synch with the rotation of the earth.
If you watch here at 11:59:59 UTC (6:59:59 EST), and you don't blink, you may see the USNO clock go to 11:59:60 UTC before advancing to 12:00:00 UTC.
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