The biggest threat facing the United States – and the world – is the spread of nuclear material to rogue states and terrorists. So say terrorism experts. Both major American presidential candidates concurred in last week’s televised debate. So why is the US moving plutonium from military to less secure civilian control? And why, critics ask, is it embarking on research programs that teach other nations how to use plutonium in nuclear power plants after a quarter-century of opposing such moves? That’s what Tom Clements wants to know.Full Story