Bismuth has long been considered as the element with the highest atomic mass that is stable. However, in 2003 it was discovered to be weakly radioactive: its only primordial isotope, bismuth-209, decays via alpha decay with a half life more than a billion times the estimated age of the universe.lemental bismuth may occur naturally, although its sulfide and oxide form important commercial ores. The free element is 86% as dense as lead. It is a brittle metal with a silvery white color when freshly produced, but is often seen in air with a pink tinge owing to surface oxidation.
President Obama is lifting some restrictions on Cuban Americans' contact with Cuba and allowing U.S. telecom companies to operate there, opening up the communist island nation to more cellular and satellite service, White House press secretary Robert Gibbs announced at his regular news briefing today.
In fact, the Cuban regime showed remarkable contempt for Obama. It rounded up some protesters and dissidents just before Air Force One landed. Obama gave Cuba what it wanted, and he got nothing of value in return. But the question is beside the point. It hardly matters what Obama or the United States got out of the trip. What matters are the rights of the Cuban people. They remain the same â severely limited, bordering on none. In fact, in Obamaâs presence, Cuban President RaÃºl Castro insisted that there are no political prisoners. âGive me a list of the political prisoners and I will release them immediately,â Castro said, responding to a reporterâs question.