A new analysis of more than 1,700 supernovae is questioning whether the universe is really accelerating at all. After accounting for the ages of the stars that produce these explosions, researchers ...

Katina Tibbetts is determined to hold all her students to high standards. But she also knows that different kids need different kinds of help to get there. Tibbetts, who teaches 1st, 3rd, and 5th ...

Some readers may find this surprising, but the clock doesn't start on our acceleration runs right when the vehicles start rolling. This practice, which is commonly called rollout, comes from the drag ...