Most teenagers go to summer camp in order to learn arts and crafts, hang out beside a lake in the northern wilderness, and perhaps learn to horseback ride. Nevertheless, every year a small handful of teenagers opt out of the traditional camp and travel to the desert of the American Southwest. Instead of learning how to build a fire they discover how to use research-grade telescopes, instead of discussing the latest fashions they debate planetary formation, and instead of identifying plant types they identify the hydrogen line in Vega. What kind of person spends free time doing that?