Researches in Surrey, England, have discovered how to slow light down and trap it in glass. I was immediately reminded of a story by one of the great Irish science fiction writers, Bob Shaw, in his “Light of Other Days”; Slow Glass was glass that took months or years to pass light from one side to the other, and he crafted that idea into a short story of heartbreak and loss.
SciFi.com has the entire short story here… I’ve loved it since the first time I read it.