June 30 Will Be One Second Longer This Year, and That Could Be a Problem

Because Earth's rotation is slowing ever so slightly, we occasionally need to add an extra second to re-sync our super-precise atomic clocks to our planet's rotation. But you know who's not on board with that? Those damn computers, whose operating systems just can't handle it. The last time we added a leap second in 2012, it wreaked havoc across the Internet .