In an effort to bring Iran to the negotiating table over its nuclear program through economic pain, both the U.S. and the European Union have imposed sanctions that should make it harder for Iran to sell its oil. Supporters of the sanctions have devised complex statistical models to show how they can be effective without disrupting the global economy.

A coordinated series of devastating attacks in Kano, the largest city in Nigeria's Muslim north, killed nearly 200 people and has left residents on edge. Another blast destroyed a police station Tuesday; the radical Islamist sect Boko Haram has claimed responsibility.

People around the globe know they should be exercising more and eating better. But food manufacturers aren't helping, with dubious health claims and confusing nutrition labels. That's the word from a global survey on nutrition information.

Academy Award nominations were announced Tuesday morning. Hugo got the most nominations, followed by The Artist. Melissa Block talks to NPR film critic Bob Mondello.

Robert Siegel talks with Sherif Mansour about the events that have unfolded in the year since the Egyptian revolution began. Mansour is an Egyptian democracy activist, who is also a senior program officer for Freedom House's Middle East and North Africa programs.