Light and matter united
Light can be stopped and restarted?
i don't understand how cooling Na helps stop light - or what the "signature" encoded in the light is ...
Harvard brainiac Lene Hau uses Bose-Einstein condensates to "freeze" light, stopping it and effectively storing it as matter.
Annotated link http://www.diigo.com/bookmark/http%3A%2F%2Fwww.news.harvard.edu%2Fgazette%2F2007%2F02.08%2F99-hau.html