The memories of the brother of one of the victims of the Columbine mass school shooting; plus the story behind 'A Raisin in the Sun' - the first play on Broadway by a black woman; the world's first space tourist, the origins of organic farming and the auto-destructive art movement of the 1960s.
Photo: Students from Columbine High School run under cover from police, following a shooting spree by two masked teenagers. April 20th 1999 (Mark Leffingwell/AFP/Getty Images