I once knew a girl who read medical memoirs from age 8, and shortly thereafter identified her future employer as the Epidemic Intelligence Service at the Centers for Disease Control. She eventually headed off to college as a pre-med student, where she encountered Chemistry, which she hated. She suffered through, earning a hard-won B. Then, facing two semesters of Organic Chemistry, she concluded that the ensuing decade of medical training would be similar. She dropped off the track.