wonderful experiment at the exploratorium in san francisco. it's my favorite. and all it is, is there's a cylinder, a plexiglass so you can see inside, and a vacuum pump. and you squirt a little water in a little cup. and you put the water in the cup at room water temperature, you can even put your hand in there and everything, and you close the thing. you throw the switch. stretch it. take the air out. it starts to lower the pressure. and guess what the little water in the cup starts to do, gang. boil. begin with a b. - boil. - boil. and people walking by don't know what's going on, and they see the boiling water. and they ask questions like, "gee, how are they heating it up?" they're not heating it up. "but it's boiling." "the only time you ever see boiling "with someone heating it up, honey. but there's boiling when you don't heat it up too." there's two things that go on with boiling. what are they? the heat you give and the pressure you exert. and if you change either one,