March 25

1655: Christiaan Huygens discovered Titan, Saturn's largest moon. 1865: French physicist Pierre-Ernest Weiss, who determined the Weiss magneton unit of magnetic moment, was born. 1923: Kenneth Franklin, who along with Bernard Burke in 1955 discovered that Jupiter emits radio waves, was born. 1925: John Logie Baird held the first public demonstration of his television system at the Selfridges department store, Oxford Street, London. 1928: Jim Lovell, commander of the Apollo 11 moon mission, was born 1951: Harold Ewen and Edward Purcell first detected the 21 cm emission from neutral hydrogen in the Milky Way. 1954: RCA announced production of color television sets. 1960: A guided missile (Regulus I) was first launched from a nuclear powered submarine (Halibut). 1961: Sputnik 10 carried a dog into (and back from) Earth orbit. 1970: The Concord SST (#002) flew for the first time on Mach 1. 1992: British scientists discovered a new largest perfect number, 2756838*(2756839-1). 1997: Former President George Bush, at age 72, parachuted from a plane over the Arizona desert.