British overcome Argentina in Falklands war (April 2–June 15).Israel invades Lebanon in attack on P.L.O.(June 4). John W. Hinckley, Jr., found not guilty because of insanity in shooting of President Reagan(June 21).Alexander M. Haig, Jr., resigns as secretary of state (June 25). Equal Rights Amendment fails ratification (June 30).Princess Grace, 52, dies of injuries when car plunges off mountain road; daughter Stephanie, 17, suffers serious injuries (Sept. 14). Lebanese Christian Phalangists kill hundreds of people in two Palestinian refugee camps in West Beirut (Sept. 15).Leonid Brezhnev, Soviet leader, dies at 75 (Nov. 10).Yuri V. Andropov, 68, chosen as successor (Nov. 15). Permanent artificial heart implanted in human for first time in Dr. Barney B. Clark, 61, at University of Utah Medical Center in Salt Lake City (Dec. 2).