This year may feel as if it will never end. Now timekeepers are making it even longer by adding a leap second to it.
The Earth is slowing down, requiring timekeepers to add an extra second to atomic clocks. The second will be tacked on to Dec. 31 between 6:59:59 and 7 p.m. Eastern Standard Time.
The world started adding leap seconds in 1972. This is the first since 2005.