Walter Cronkite (right) listens as Dr. J. Presper Eckert (center) describes the functions of the UNIVAC I computer he helped develop in the early 1950s. AP hide caption

itoggle caption AP

Untitled, by South African artist Gavin Jantjes, is one of the works in the "African Cosmos" exhibition. National Museum of African Art hide caption

itoggle caption National Museum of African Art

The Bark winds through southeastern Wisconsin's "Kettle Moraine" — small hills called drumlins and deep glacial lakes known as kettles. It's part of the Mississippi watershed. Liam O'Leary hide caption

itoggle caption Liam O'Leary

The John B. Hayes Federal Building in Wilkesboro, N.C., is among several federal courthouses being closed in the South. Michael Tomsic/WFAE hide caption

itoggle caption Michael Tomsic/WFAE

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

itoggle caption Getty Images

McGovern listens to a constituent in 1974. Jim Mone/AP hide caption

itoggle caption Jim Mone/AP

Mao Zedong signs Sidney Rittenberg's copy of The Little Red Book during a gathering of party leaders in Beijing on May 1, 1967, at the beginning of China's Cultural Revolution. Courtesy of Sidney Rittenberg hide caption

itoggle caption Courtesy of Sidney Rittenberg