They start taking up their usual places shortly after 6:30 in the morning, about half an hour before the buses arrive. At first it's just a lone figure, sitting on the tile floors of the high school lobby with the tiny iPod earbuds stuck in her ears, then here comes a couple standing together by the door, silent. Another student leans against the wall in sleepy contemplation. The silence starts turning so slowly at first, one doesn't really notice, until words grow louder, laughter multiplies, and suddenly the observer finds herself in the middle of a crowd, having to raise her voice to be …