The International Atomic Energy Agency has issued a new report on Iran's suspect nuclear program. It says Iran has conducted experiments that could only be useful in the development of a nuclear weapon. Guy Raz talks to NPR's Mike Shuster for more.

Robert Siegel speaks with Associated Press intelligence correspondent Kimberly Dozier about how the CIA uses social media.

A year ago, the existence of Stuxnet, the world's first cyber superweapon, first emerged. Many experts suspect the U.S. government had at least a hand in its creation. The development and use of offensive cyberweapons may create challenges for a nation's cyberdefenders — and could be a big policy issue in the nascent era of cyberwarfare.

The Marines of Darkhorse Battalion suffered a high rate of casualties during their seven-month deployment to southern Afghanistan. Their mission was to go after the Taliban in a place called Sangin — a crossroads of insurgency and drug trafficking. At the time, officials in the military and all the way up to the secretary of defense asked why the Darkhorse Battalion was taking so many casualties. NPR Pentagon correspondent Tom Bowman is reporting all week on the battalion. On Wednesday, he speaks with Guy Raz about the strategy in Sangin: whether the Marines made mistakes and what they did to reduce causalities and complete the mission.

Former Secretary of State and National Security Advisor Condoleezza Rice was among the head architects of the way America responded to the Sept. 11, 2001 attacks. She was also at the center of divisive debates within the George W. Bush administration. In her new memoir No Higher Honor, she defends and explains Bush's decision to engage in war in Iraq, and shares how her work took a toll on her personal life. She speaks with host Michel Martin.