I feel the need to reiterate here.
The speed of light, as we've all heard, is a constant: 186,171 miles per second in a vacuum. But it is different in the real world, outside a vacuum; for instance, light not only bends but also slows ever so slightly when it passes through glass or water. Still, that's nothing compared with what happens when Hau shines a laser beam of light into a BEC: it's like hurling a baseball into a pillow. "First, we got the speed down to that of a bicycle," Hau says. "Now it's at a crawl, and we can actually stop it—keep light bottled up entirely inside the BEC, look at it, play with it and then release it when we're ready."
I can say I'd kill to see a Bose-Einstein condensate in action. Turning on a light and not seeing it hit the wall until minutes later, or to keep it frozen and bottled. We've long known that light could be slowed or trapped by an extremely powerful mass and gravity well, such as a black hole, now we know at least one more way that it can be done. Still, this has to be amazing to witness, perhaps even a little creepy.