A general view shows participants before the start of two days of closed-door nuclear talks at the United Nations offices in Geneva Switzerland, Thursday, Nov. 7, 2013. Six world powers are dangling the prospect of easing some sanctions against Iran if Tehran agrees to curb work that could be used to make nuclear weapons. Talks resume Thursday between Iran and the six _ The United States, Russia, China, Britain, France and Germany. (AP Photo/Keystone, Martial Trezzini)