Sept. 12 (UPI) -- On this date in history: In 1609, Henry Hudson discovered what is now known as the Hudson River. In 1940, near Montignac, France, the prehistoric Lascaux cave paintings, believed to be 15,000-17,000 years old, were discovered by four teenagers who stumbled upon the ancient artwork after following their dog down a narrow entrance into a cavern. In 1953, U.S. Sen. John Fitzgerald Kennedy married Jacqueline Lee Bouvier at St. Mary's Church in Newport, R.I. In 1958, Little Rock