In January I wrote a piece titled “ 5 Physics Equations Everyone Should Know .” Lots of you weighed in with your own nominations, and there were plenty of good suggestions. So I’ve decided to do a ...

Psychologists say “time expansion” is real—moments when your brain slows reality, stretching seconds into minutes during accidents, sports, or meditation.

Kinetic energy has to do with the motion of an object—the faster it’s moving, the more kinetic energy it has. If you take a ball and drop it, it will accelerate downward, which means its kinetic ...