i was at work today and i was on break walking around when i saw an open water fountain... well it looked pretty much like a regular water cooled computer, except it had copper pipes, the radiator and fan were much bigger and i thought 'cool'... when examining i found that the radiator was on bottom with fan and pump (i think - it was a black cylinrical structure pretty wide and had a domish top with one pipe in and one out), then on top was a thing enclosed in styrofoam with one pipe in and one out, there was a little hole in it i could make out some copper but thats it. well by the end of the day it was finished and i took a drink out of it and it was pretty dam cold, then i thought how does it get this cold? it cant just be the rad+fan can it? any ideas on what makes it that cold? would it be practical in computer cooling? or am i just thinking way too much, or not enough?