13 March It Happened Today
1733 Birth of English chemist Joseph Priestley, credited with discovering oxygen.
1781 Uranus is confirmed as a new planet in the solar system.
1881 Tsar Alexander II is assassinated.
1939 Birth of American singer Neil Sedaka.
1974 Charles De Gaulle airport in Paris is opened.
1996 Sixteen pupils and a teacher are killed by a gunman at their school in Dunblane, Scotland.