A report on Friday from the International Atomic Energy Agency provided new evidence that Iran's nuclear program includes clandestine efforts to build a bomb. The report, circulated among the UN watchdog agency's member countries, includes satellite images, letters, diagrams and other documents. It alleges Iran has been working to acquire equipment and weapons design information, testing high explosives and detonators and developing compute models of a warhead's core. Taken together, it's the most unequivocal evidence yet that the Iranian program ranges far beyond enriching uranium for use in energy and medical research, which is what Tehran says it's for.