Today is the 143rd day of 2012 and the 64th day of spring.
TODAY'S HISTORY: In 1807, former vice president Aaron Burr was indicted for treason.
In 1947, President Harry S. Truman signed into law the Truman Doctrine, which was intended to combat the spread of Communism.
In 1992, Johnny Carson signed off as the "Tonight Show" host for the last time.
In 2011, a tornado ripped through Joplin, Mo., claiming an estimated 162 lives.
TODAY'S BIRTHDAYS: Richard Wagner (1813-1883), composer; Mary Cassatt (1844-1926), artist; Sir Arthur Conan Doyle (1859-1930), writer; Laurence Olivier (1907-1989), actor/director; Charles Aznavour (1924- ), singer/songwriter/actor; Morrissey (1959- ), singer; Naomi Campbell (1970- ), fashion model; Ginnifer Goodwin (1978- ), actress; Apolo Ohno (1982- ), speed skater.
TODAY'S SPORTS: In 2003, Annika Sorenstam became the first woman golfer since 1945 to officially compete against men at a PGA tour event.
TODAY'S FACT: A group of Confederate Army veterans formed the Ku Klux Klan in Pulaski, Tenn., in 1865.
TODAY'S QUOTE: "It is a capital mistake to theorize before one has data." -- Sir Arthur Conan Doyle
TODAY'S NUMBER: 73 -- electoral votes Aaron Burr received in the 1800 presidential election, which tied him with Thomas Jefferson. The House of Representatives cast the deciding votes, which made Jefferson president and Burr vice president.
TODAY'S MOON: Between new moon (May 20) and first quarter (May 28).