Robert Frank is considered one of the 20th century's greatest photographers
                                
                                
                                    (Newser) -
                                    Robert Frank, a giant of 20th century photography whose seminal book The Americans captured singular, candid moments of the 1950s and helped free picture-taking from the boundaries of clean lighting and linear composition, has died. He was 94, the  AP  reports. Frank died Monday on Cape Breton Island in Nova...