We physicists used to laugh at Star Trek's warp factor. We don't laugh anymore. About 10 years ago, a Mexican relativist named Miguel Alcubierre was watching Star Trek, and he came up with a new solution to Einstein's [general relativity] equation. The loophole is negative matter -- Einstein never considered it. And Alcubierre got a solution that looked very similar to warp drive. The key is, you don't go to the stars, the stars come to you. Everybody assumes you have to go to the stars, which means you have to break the light barrier and violate the laws of physics. But you can compress the space like an accordion -- compress the space between you and the stars. It's like a wrinkle in space. There are some objections to this, of course. We don't have negative matter, for instance. But in principle, if you have, let's say, a meteorite made of negative matter, then it may be possible. Einstein never said that nothing can go faster than light. Empty space can contract or expand faster than the speed of light. That's the Big Bang. It's emptiness that expanded. It looks very similar to the rendition of warp drive in the movies -- you would see distortion of star light, stars would come at you very fast, but inside you feel nothing.