It is too bad you can't say more about this, one of the fun things I got to do a couple of years ago was to stare into the pool of the Reed Research reactor running at power and look at the awesome Cerenkov radiation (that eerie blue glow, it looked exactly like this : http://en.wikipedia.org/wiki/File:Cerenkov_Effect.jpg [yes that is the actual reactor, no I didn't take this picture :-)])