Coastal communities in the United States, be forewarned. A "dramatic" surge in high-tide floods is just over a decade away in the US, according to NASA.
For billions of years, Earth’s rotation has been gradually slowing down. It’s a process that continues to this day, and estimates suggest that the length of a day currently increases by about 1.8 milliseconds every century. The day's length varies slightly from year to year, as well; the result of myriad forces both on and off Earth pushing and pulling at its rotation.