Television in the United States Gray Television, whose 131 stations cover mostly smaller metropolitan areas reaching only 10% of the population. The five major U.S. broadcast television networks are the National Broadcasting Company (NBC), CBS (formerly known as the Columbia Broadcasting System), the American Broadcasting Company (ABC), the Fox Broadcasting Company (Fox) and the CW Television Network. The first and elder three (which are colloquially known as the "Big Three") began as radio networks: NBC and CBS respectively began operations in 1924 and 1927, while ABC was spun off from NBC to Edward J. Noble in 1943 as the Blue Network during FCC inquiries over
Noble gas a noble gas until 1904 when its characteristics were found to be similar to those of other noble gases. Rayleigh and Ramsay received the 1904 Nobel Prizes in Physics and in Chemistry, respectively, for their discovery of the noble gases; in the words of J. E. Cederblom, then president of the Royal Swedish Academy of Sciences, "the discovery of an entirely new group of elements, of which no single representative had been known with any certainty, is something utterly unique in the history of chemistry, being intrinsically an advance in science of peculiar significance". The discovery of the noble gases