Geography of Teeth

Was reading the recent National Geographic Article about stonehenge. They discovered a burial site of a rich neolithic man in the Salisbury plain near Stonehenge. Turns out he was originally from the Southern Alps of Europe, and apparently had migrated to that area...how I'm not sure. But they discovered this information by doing an Isotopic Tooth Analysis. I just thought that was pretty cool that they can determine geography via your teeth. Here are a few articles that might be of interets: here and here.