Each spring, thousands of proud and impoverished parents watch their children graduate from colleges all over the country. The ceremony is called "commencement," because it signals the beginning of adulthood, financial responsibility, real work, dull parties, and all the other horrors of grown up life. It's a scary time for the graduates, comparable to going over the top in the trench warfare of World War One, and facing the enemy for the first time. That's why the graduate schools are full. These days especially it makes sense to stay out of the firing line as long as possible.