This handout photo provided by the National Portrait Gallery, taken in 1951, shows Billie Holiday, by Bob Willoughby. Curators at the National Portrait Gallery want to know what it means to be cool. They have been studying the uniquely American concept of “cool” and how it became a global export, and the museum now is bringing together 100 photographs of people who helped create the idea of “cool” as a name for rebellion, self-expression, charisma, edge and mystery. It includes musicians, actors, singers, athletes, comedians, activists and writers as photographed by Richard Avedon, Annie Leibovitz and others. (AP Photo/Bob Willoughby, National Portrait Gallery)
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