David Brooks had an interesting column about a longitudinal study of 268 young men, including John F. Kennedy, who entered Harvard College in the late 1930s. What's fascinating is how unpredictable their lives and behaviors were. "It is as if we all contain a multitude of characters and patterns of behavior, and these characters and patterns are bidden by cues we don't even hear," Brooks wrote. "They take center stage in consciousness and decision-making in ways we can't even fathom. The man who is careful and meticulous in one stage of life is unrecognizable in another context."