June 29 2022, marked the shortest day on earth since the invention of Atomic Clocks. Our planet completed its rotation 1.59 milliseconds faster
Scientists believe that it's due to global warming. As the north and south pole melt, the mass is moving closer to the center which increases rotational speed
A leap second is a second added to UTC to accommodate the difference between atomic time and solar time. Since the earth is now rotating faster, a leap second would be removed