Today is the 207th day of 2012 and the 36th day of summer.
TODAY'S HISTORY: In 1952, Puerto Rico became a self-governing U.S. commonwealth.
In 1956, the Andrea Doria ocean liner collided with the cruise ship Stockholm off the New England coast and sank the next day, killing 51.
In 1978, the first "test-tube baby," Louise Brown, was born in England.
In 2005, two major unions, the Teamsters and the Service Employees International Union, withdrew from the AFL-CIO.
TODAY'S BIRTHDAYS: Henry Knox (1750-1806), first U.S. secretary of war; Eric Hoffer (1902-1983), philosopher; Rosalind Franklin (1920-1958), biophysicist; Estelle Getty (1923-2008), actress; John Gibson (1946- ), radio/TV personality; Walter Payton (1954-1999), football player; Iman (1955- ), model/actress; Thurston Moore (1958- ), musician; Matt LeBlanc (1967- ), actor.
TODAY'S SPORTS: In 1976, American Edwin Moses ran in his first international track and field event at the Montreal Olympics -- the 400m hurdles -- and won a gold medal with a world record-setting time of 47.64 seconds.
TODAY'S FACT: In plebiscites held in 1967, 1993 and 1998, Puerto Rican voters chose to retain commonwealth status.
TODAY'S QUOTE: "A man is likely to mind his own business when it is worth minding. When it is not, he takes his mind off his own meaningless affairs by minding other people's business." -- Eric Hoffer
TODAY'S NUMBER: 3.2 million -- approximate combined membership of the Teamsters and the Service Employees International unions in 2012.
TODAY'S MOON: Between new moon (July 19) and first quarter moon (July 26).