Mount Washington rises rumpled and soft above the New Hampshire forests, beyond the brick towns, the old mills, and the cold cities, but not really too far away from anything. Just within reach. In summer you can even drive up it. On a clear day you might almost see home from the summit, and the Atlantic Ocean gleams calmly on the horizon, a thin sliver of mercury. It's practically in the backyard, people say. How dangerous can it be?