1582: The Gregorian calendar was introduced in Italy and some other Catholic countries. 1882: Robert Goddard, "the father of modern rocketry," was born. 1930: Pavel Popovich, who along with fellow cosmonaut Andriyan Nikolayev became the first pair of humans in space, was born. 1947: President Truman delivered the first televised White House address, where in he asked Americans to refrain from eating certain foods to stockpile supplies for sending to Europeans suffering from crop failures. 1966: A partial core meltdown at the Enrico Fermi nuclear breeder reactor killed three workers. 1970: The Public Broadcasting System (PBS) officially became a network. 1983: Earl Tupper, inventor of the plastic Tupperware, died. 1992: 1992: Both houses of Congress voted to override President Bush's veto of a measure to re-regulate cable television companies. 1996: Supercomputer pioneer Seymour Cray died.