This Day in History ClassThis Day in History Class

First leap second added to UTC - June 30, 1972 

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At 11:59 p.m. and 60 seconds, a leap second was added to Coordinated Universal Time to synchronize clocks with Earth’s decelerating rotation. 

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This Day in History Class

From the desk of “Stuff You Missed in History Class,” “This Day in History Class” quickly recounts a 
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