What makes a hero? Why do we remember some stories and not others?

Consider Claudette Colvin. She was a 15-year-old girl in the segregated city of Montgomery, Alabama. On March 2, 1955, she refused to give up her seat on a bus to a white passenger.

Nine months later, Rosa Parks did the exact same thing. Parks, of course, became a powerful symbol of the civil rights movement. But Claudette Colvin has largely been left out of the history books.