There are several other 'cold heat' sites on the Web, and they are fine sites dedicated to various things, but I think this is the only one that is literally about cold heat. It's about heating and heat flow in gases cooled to within a millionth of a degree above absolute zero temperature. (Even though they are so cold, the gases don't become solid, because they are kept at extremely low pressure.)
This is an active research field in current physics, and has been for about fifteen years. In 2001 the Nobel prize was awarded for a big experimental breakthrough on this stuff. It's a pretty technical topic, but I'm going to try to make it understandable.
Why read this? Well, the technical details of quantum gases are pretty heavy going, but the basic questions we're investigating are really profound. They go right to the heart of what matter is, what physics is, and how things really are.
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