Two days this summer have been unusually short, with the shortest expected on Aug. 5, leading global timekeepers to consider adding a negative leap second. When you purchase through links on our site, ...

July 9 was unusually short thanks to changes in how fast the Earth is spinning. But two other days this summer are expected to be even shorter. When you purchase through links on our site, we may earn ...

Billions of years ago, Earth was an uninhabitable rock covered in magma. Scientists are still working to decipher the tale of how it transformed into a blue and green orb teeming with life. However, ...