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Time Essay: The Scientific Pursuit of Happiness

mc² may well = E in the known physical universe. Nothing quite that pat can be said about the cosmos of the human temperament. In the play of emotion, logic is seldom evident, and the laws of gravity and thermodynamics never. What goes up in the psyche sometimes does not come down; the boiling points of individuals and collectives alike are impossible to fix. In light of this, it is no wonder that science long shied away from studying, or attempting to explain, that most subtle and elusive of all human moods: happiness. Instead,...

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RAY KELLY, New York City Police Commissioner, on the arrest of a New Jersey man in one of the nation's most baffling missing-children cases, the disappearance more than three decades ago of 6-year-old Etan Patz.
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