Iran seen as at least 5 years from bomb

Herald Tribune:LONDON A leading British research institute said Tuesday that Iran was at least five years away from producing sufficient material for "a single nuclear weapon" - but only if Tehran chose to ignore international reaction and "throw caution to the wind."
The International Institute for Strategic Studies said its conclusions were based on a variety of public sources of information, including visits to Iranian nuclear sites arranged by the Iranian authorities. "Nevertheless," the institute's director, John Chipman, told reporters, "there remains a good deal that cannot be known for certain from the outside