Scientists spend their careers trying to understand how the world works. Yet even in their own specialties, complete understanding may remain elusive. That idea lies at the center of a new article by Richard Shiffrin, distinguished and Luther Dana Waterman professor of Psychological and Brain Scienc es in the College of Arts and Sciences at Indiana University Bloomington, Stephen Stigler of the University of Chicago, and Frank Keil of Yale University. ...read more read less