Re: the more you know
absolute zero is -273.15 degrees centigrade (or 0 K).
in 2005, researchers at CERN in Finland cooled helium to 100 piko kelvin (or one tenth of one billionth of a degree above absolute zero). It is not possible to actually cool something all the way to absolute zero, as it would require an infinite time horizon and an infinitely large machine.
when liquids are cooled to very close to absolute zero, one of the strange properties they exhibit is called superfluidity. among other things, superfluids will only rotate at certain speeds....so if you put a superfluid into a container and start to spin the container, the superfluid will stay stationary until a critical speed is reached, at which point the superfluid will start to spin. thus the superfluid is quantized in terms of rotational velocity. <-think about that!
another strange property of some superfluids (Bose-Einstein condensates) is that they can slow light down to unimaginably slow speeds relative to the speed of light. in an experiment, they passed a beam of light through a B-E condensate and slowed it from its usual speed of 299,792,458 meters per second down to a crawling 17 meters per second (the speed of a road bicycle).
yes i'm a big nerd...but i love reading about shit like this.