December 13 1545: Council of Trent began. 1816: Werner von Siemens, German electrical engineer who helped develop telegraph industry (and for whom the unit of conductance is named after), was born. 1903: Wright Brothers made their first flight at Kittyhawk, NC. 1920: first accurate measurement of the size of a fixed star was made on Betelgeuse and was found to be 260 million miles in diameter - 150 times larger than the previous measurement. 1934: Thomas Watson, assistant to Alexander Graham Bell, died. 1939: Perkin Elmer incorporated. 1940: French biophysicist Jacques-Arsθne d' Arsonval, who invented the reflecting moving-coil galvanometers used to measure weak electric currents, died. 1962: The first U.S. communications earth satellite to transmit telephone, television, teleprinter & facsimile signals, Relay I, was launched. 1990: Tim Berners-Lee launched the World Wide Web. 1994: first meeting of the World Wide Web (W3) Consortium took place in Cambridge at the Massachusetts Institute of Technology. | 
