now, when this does happen, and the one with a low kinetic energy happens to be h2o, and it's near a neighbor that just did the same thing, that made some other oxygen or nitro molecule go faster and give up its energy and gets over to here, these h2os will coalesce and then become-- more and more happen. what happens here, this becomes a little droplet. it's not part of the air anymore. there's your condensation. what is left behind? the air is warmer. can you see that? so in the last bounce of h2o with the air molecule, the last bounce that gives up most of its energy to this one, and then they coalesce, that last-bounce energy warms up the air. this happens even when it's snowing, especially when it snow. one time, i'm with my friends up at the lake tahoe, and i'm up at the top of the mountain. and i said--and all of a sudden, i feel it really, really getting warm. and i'm just kidding around and going like this, "humba, humba, humba, snow, snow, snow." and someone says, "hewitt, you're taking yourself too seriously." and all of a sudden-- "hewitt, son of a gun, i underestimated yo