Polonium in the Earth's crust are not harmful. Polonium has been found in tobacco smoke from tobacco leaves grown with phosphate fertilizers. Because it is present in small concentrations, isolation of polonium from natural sources is a tedious process. The largest batch of the element ever extracted, performed in the first half of the 20th century, contained only (9 mg) of polonium-210 and was obtained by processing 37 tonnes of residues from radium production. Polonium is now usually obtained by irradiating bismuth with high-energy neutrons or protons. In 1934, an experiment showed that when natural Bi is bombarded with neutrons, Bi
Discover Financial Discover Financial Discover Financial Services, Inc. is an American financial services company that owns and operates Discover Bank, which offers checking and savings accounts and credit cards. It also owns and operates the Discover and Pulse networks, and owns Diners Club International. Discover Card is the third largest credit card brand in the United States, when measured by cards in force, with nearly 50 million cardholders. Discover is currently headquartered in the Chicago suburb of Riverwoods, Illinois. Sears introduced the Discover credit card in 1985 in conjunction with real estate franchise Coldwell, Banker & Company and brokerage firm Dean Witter