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On the Republican side, Donald Trump is projected to win in Georgia. For the Democrats, Hillary Clinton takes Georgia and Virginia, while Bernie Sanders won in his home state of Vermont.

Even low levels of lead in children can cause learning or behavioral problems, the CDC says. But foods packed with calcium, iron and vitamin C can help reduce the absorption of lead in kids.

President Obama says the U.S. and its allies are ratcheting up the military campaign against ISIS. But Obama says military force is just one aspect of American power. He points to the climate agreement in Paris as another example of American leadership.

Politicians are pressing social media and tech firms to do more to rein in the online presence of terrorist groups. But there are challenges, including defining what constitutes terrorist content.

Republican presidential candidates square off in Las Vegas Tuesday in the last debate of 2015. Marco Rubio and Donald Trump each held rallies there, and the two events were different from each other.

President Obama says ISIS is rapidly losing ground in Iraq and Syria. David Greene talks to Democratic adviser Bruce Jentleson about whether the president is succeeding in assuaging Americans' fears.

Research finds that viewers who binge watch are less engaged with ads than viewers who watch TV shows periodically. We explore the psychological reasons why binge watchers are less interested in ads.

NPR's Audie Cornish talks to Andy Greenberg, a senior writer at Wired, about the mysterious founder of Bitcoin. He explains what the leading theories are about the true identity of the founder.

Seriously, do you understand how the Galactic Senate functioned?

According to numbers compiled by the Death Penalty Information Center, the number of people executed in the United States is at its lowest level since 1991. Death sentences are down 33 percent.