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Leap second

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http://money.cnn.com/2015/06/30/technology/leap-second/index.html

This evening, a "leap second" threatens to wreak havoc across the Internet.
The extra second will take place at 8 p.m. ET on Tuesday so that we can sync up our watches with the Earth's slowing rotation. But the 61-second minute threatens to make computer systems go haywire, potentially crashing websites and screwing up the software that powers the world's financial markets.

The previous leap second, which took place in 2012, brought down Reddit, Yelp (YELP), LinkedIn(LNKD, Tech30), FourSquare, Gawker and StumbleUpon, among other sites and apps. Qantas' entire computer system went down, forcing employees to check in passengers by hand.

The reason those sites went down -- in some cases for hours -- is that the software controlling large computing systems and much of the Web doesn't play nicely with leap seconds.
 
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