President Barack Obama has defended the use of drones as a “just war” of self-defense against deadly militants, and a campaign that had made America safer.

Bestselling Nigerian author, Chimamanda Ngozi Adichie speaks with Anchor Marco Werman about race, identity, and hair. These are all themes from her new novel, ‘Americanah.’

A US Senate committee approved a large immigration bill on Tuesday. It’ll hit the Senate floor soon and then the House of Representatives. If it passes, the bill will offer 11 million immigrants living in the US illegally a path to citizenship.

Chinese dissident Ai Weiwei’s unusual and outspoken art has surfaced anew on the Internet. His new music video, Dumbass, is a strongly worded song protesting China’s abuse of state power.

Rescue efforts continued Tuesday to uncover survivors from the tornado that came through Moore, OK. It has been preliminarily declared a category F4, that is Fujita Scale 4. The system of rating tornadoes was developed by Ted Fujita, a scientist from Japan.

A post-Fukushima effort to crowdsource radiation data in Japan has since become the largest source of radiation data in the country. And it’s now set to expand to other parts of the world. Catherine Winter reports from Tokyo.

Slideshow: Safecast’s bGeiges

In the midst of a security vacuum, a looming economic crisis and a political stalemate in Egypt, no one is paying much attention to culture. If and when they do, artists don’t expect much encouragement from the new Islamist government. But for the moment, they are taking advantage of a new margin of freedom, using public spaces and trying to reach wider audiences.

The European Union has passed a law banning unlabeled olive oil flasks and dipping bowls, the kind traditionally seen in restaurants in Spain. Instead, restaurants must offer sealed, clearly labelled throw-away oil containers.

There’s a new study out about the risk of ocean pollution caused by shipwrecks. The National Oceanic and Atmospheric Administration has come up with a map of the many, many shipwrecks that dot US coastal waters.