Polonium initiator was classified until the 1960s. The Atomic Energy Commission and the Manhattan Project funded human experiments using polonium on five people at the University of Rochester between 1943 and 1947. The people were administered between of polonium to study its excretion. Polonium is a very rare element in nature because of the short half-life of all its isotopes. Po, Po, and Po appear in the decay chain of U; thus polonium can be found in uranium ores at about 0.1 mg per metric ton (1 part in 10), which is approximately 0.2% of the abundance of radium. The amounts
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