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.
Also read: Some Internet services are sputtering today