We have a cleanroom at the school that I go to that is prettyold. I's a class 100 cleanroom (which means there are on average 100particles of any kind per cubic foot). We have to go in there to fabricatethe nanoscale devices that we test in our lab upstairs. I am in there morethan I would like and the loud rush of air in the air handlers is enough todrive you insane. If you want to find out more about the science Iperpetrate, you can see my science page.