With the advent of radio and television, presidential charisma became a more important personality characteristic. Above, Franklin Delano Roosevelt, who is rated one of the most charismatic presidents; John F. Kennedy; Bill Clinton. Getty Images hide caption

The United States and Cambodia are locked in a legal battle with the auction house Sotheby's over this 1,000-year-old statue of the Hindu warrior Duryodhana that may have been looted from the Cambodian temple complex at Koh Ker. Courtesy of the U.S. Attorney's Office hide caption

This image, from an archival video, shows the white whale NOC swimming around and under researchers' boats. Current Biology hide caption