Radium seventh of a gram of radium. One kilogram of the Earth's crust contains about 900 picograms of radium, and one liter of sea water contains about 89 femtograms of radium. Radium was discovered by Marie Sklodowska-Curie and her husband Pierre Curie on 21 December 1898, in a uraninite (pitchblende) sample. While studying the mineral earlier, the Curies removed uranium from it and found that the remaining material was still radioactive. They separated out an element similar to bismuth from pitchblende in July 1898, that turned out to be polonium. They then separated out a radioactive mixture consisting mostly of two
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