The Earth's rotation doesn't line up perfectly with our calculation of it, so to keep things consistent, we have to adjust. That's why this weekend will have a leap second. This Saturday, just before midnight Greenwich Mean Time, clocks will count to 60 seconds, instead of 59.
How should you spend that free, unexpected single second? Here are nine ideas.
Unless you’re disputing the world record in the 100-meter dash or a buzzer-beater in basketball, a single second is generally not something worth arguing about. But today in Geneva, a single second will be the topic of intense debate as hundreds of delegates from more than 70 nations decide whether or not to kill the “leap second” at a meeting of the UN’s telecommunications agency.