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 ...

In the following interviews, read what seven physicists—some string theorists and some not—have to say about the theory and some of its more mind-bending components, such as extra dimensions ...

Not only must string theory's extra dimensions shrink, but they also can shrink into innumerable different configurations, or geometries, of the vacuum of space. One of those possible geometries ...

While still theoretical and highly debated, the mathematics of string theory suggests that there could be multiple dimensions of time. Columbia University's theoretical physicist Brian Greene ...

Could axions be the yet-to-be-detected key to unraveling this mystery, or (as string theory suggests), is the particle hiding ...

String theory is perhaps the most high-profile ... 10 or 25 dimensions of space. These extra dimensions are then curled up so tightly that we don’t notice them – much like a silken thread ...