if you're at the top of the himalayas, you can see the development of industry in india. you can see when lead was put into gasoline. you can see when legislation was passed to remove it. anything that's in the air gets recorded. and perhaps, with the ice cores, probably the thing that really makes them unique is that they record the history of the earth's atmosphere. and you can see how the earth's atmosphere has changed through time. and our limitations is just interpreting how that recorder is working. when i came to ohio state university, i was prettyonvinced i was going to become a coal geologist. because, having grown up in west virginia, i could see -- one of the reasons of going to college was to get a job. and i could see the application there. in my first quarter here, i got a little note in my mailbox that said, "how would you like to work for a research program "in the institute of polar studies, looking at ice cores?" and so i took this position. it took me about a year, year and a half, to really start to realize what was archived in those ice cores, or the