Story highlights A "leap second" will be added to the world's standard time on June 30

The move is to keep clocks in sync with the Earth's rotation

(CNN) This is going to be a long year. Well, one second longer.

We're all going to get an extra tick of the clock, known as a "leap second," on June 30.

The bonus sliver of time raises a couple of questions.

How to spend that extra second? Sleeping? Working? Maybe Facebook's Mark Zuckerberg will use it to help keep up with his New Year book-reading program

Then there's the question of why we need to tinker with clocks all around the world in the first place.

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