Marie Curie doubt, the Curies sought to isolate polonium and radium in pure form. Pitchblende is a complex mineral; the chemical separation of its constituents was an arduous task. The discovery of polonium had been relatively easy; chemically it resembles the element bismuth, and polonium was the only bismuth-like substance in the ore. Radium, however, was more elusive; it is closely related chemically to barium, and pitchblende contains both elements. By 1898 the Curies had obtained traces of radium, but appreciable quantities, uncontaminated with barium, were still beyond reach. The Curies undertook the arduous task of separating out radium salt by differential
Discover Wisconsin Discover Wisconsin Discover Wisconsin is a weekly non-fictional television program which encourages tourism in the U.S. state of Wisconsin and features profiles of cities, events and tourist attractions throughout the state. The program is written, directed and produced in Madison, Wisconsin and is billed as the longest running tourism TV show in the United States. The program has won 20 National Telly Awards. Discover Wisconsin has also been nominated for 8 Emmy nominations, winning once in 2012 for its 25th Anniversary Special. Dick Rose came up with the idea for a show in 1986 to showcase Wisconsin vacation spots. Discover