String theorists are betting that extra dimensions do indeed exist; in fact, the equations that describe superstring theory require a universe with no fewer than 10 dimensions. But even physicists ...

While this could help scientists determine why matter dominated antimatter in the early universe, it could also help shed ...

That could change, though, if the universe has more than three spatial dimensions. The idea of extra dimensions grew out of string theory—which needs them to explain how the strings vibrate ...