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The world's leading medical journals have a proposal that could transform medical science: Researchers would have to publicly share their clinical data to get their studies published.

It's the largest city in the U.S. to commit to using only renewable energy. And even though stakeholders are on board, trouble could be brewing over how to implement the plan.

With the polls tightening a week ahead of the Iowa caucuses, the real-estate mogul is continuing to raise questions about whether the Texas senator is even eligible for the White House.

Persisting through cold and rough weather, Concepcion Picciotto was a fixture outside the White House, where she was often called the president's closest neighbor.

Bernie Sanders said he would raise taxes to pay for his health care plan, while Hillary Clinton emphatically explained her plans and experience to young Sanders supporters.

Despite the progress represented by the Iran nuclear deal, rising tensions between the U.S. and Russia, North Korea's nuclear tests and other conflicts mean the world is still close to catastrophe.

Hillary Clinton's spot portrays her as a voice of consistency, while Bernie Sanders is shown as a candidate of change.

This week, the Obama administration banned the use of solitary confinement for juveniles. Valerie Jarrett spoke with NPR about that and the push for changes in the criminal justice system.

NPR's Audie Cornish talks to Romanian journalist Ovidiu Vanghele about Romanian prisoners publishing scientific papers to reduce prison sentences.

The U.S. and other countries have agreed to lift sanctions imposed on Iran over its nuclear program, but Washington still has other sanctions in place against Tehran.