All of physical reality is governed by just four fundamental forces, and physicists have spent a century trying to unite them ...

Add Yahoo as a preferred source to see more of our stories on Google. abstract graphic of an atom Every action in physics is governed by some kind of push or pull. As far as we know, these all fall ...

Physicists in Switzerland are turning to a new method in the search for nature’s possible fifth force—one that might explain some of the universe’s greatest mysteries. Their work centers on atomic ...