The only time I saw the Grand Canyon was when we briefly stopped while I was helping a friend get her car across the country. It was January, no one was around, and patches of snow dotted the rim. Quite a beautiful sight. But we noticed a poster on a bulletin board detailing how a medical student who had run the Boston marathon had somehow gotten lost on a hike and died after running out of water. It was particularly shocking because my friend had known the woman who died since high school in New England, but had not heard the story until we were reading it on that poster.