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Gary Marcus suffers from what a friend jokingly describes as congenital arrhythmia--the inability, despite many hours of his youth spent practicing and taking lessons, to learn to play a musical instrument. A few years ago Marcus, a cognitive psychologist at New York University, decided at 38 to make one last try when he took up guitar. No surprise: He did not succeed in becoming the next Jimi Hendrix, but managed to acquire a modicum of skill--and went on to describe his experience in Guitar Zero: The New Musician and the Science of Learning

By Adam Marcus of Nature magazine A long-running question about how the largest species of birds achieve erect penises seems to have been settled.

Relationship expert Pepper Schwartz and professor of psychology Gary Marcus talk about what happens in our brain when we fight and what it says about us as individuals. (TODAY)