Informant38

Good Photon! Yet until recently there was one thing we couldn't do with light: pause it. Stopping light in its tracks and releasing it again unchanged was beyond human ken.
But now scientists have figured out how to do even that.
Last year, physicists at Harvard University shined a laser beam into a glass cell filled with atomic vapors. The light went in, but it didn't come out again. It was not destroyed or absorbed, but rather stored -- ready to emerge intact at the scientists' bidding.