Extra dimensions meaning mathematical realms beyond the three (or four if you count time—and you should) we are familiar with. String theory now counts up to at least 11 dimensions. Along the way, as ...

Gravity is by far the weakest of nature’s four fundamental forces, and physicists have spent decades asking a deceptively simple question: why? One answer, first sketched a century ago and refined ...

In 1919, physicist Theodor Kaluza hypothesized that extra dimensions might solve some outstanding problems in physics. And while we haven't found any evidence yet for anything outside our normal ...