1/4 President Richard Nixon and Soviet Communist Party Chief Leonid Brezhnev exchange pens used in signing an agreement on June 22, 1973, to avoid military confrontations and threats of force that might trigger nuclear war. The ceremony was in the East Room of the White House in Washington. File Photo by Frank Cancellare/UPI | License Photo On this date in history: In 1918, an empty troop train rear-ended the Hagenbeck-Wallace Circus train in Ivanhoe, Ind., killing 53 circus performers and many animals. The circus train had stopped to fix its brakes. Advertisement In 1940, France fell to Germany in World...