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155 countries and territories are switching to a different polio vaccine, in what health officials say is the next step to completely eradicating the disease worldwide.

Pope Francis visited the Greek island of Lesbos to focus on the troubles of migrants. Reporter Joanna Kakissis talks with NPR's Michel Martin about the trip and its possible effects.

Ecuador is assessing the damage and death toll after a powerful earthquake. Thomas Hollywood, director of Catholic Relief Services in South America, gives us the latest from the capital, Quito.

In a new memoir, Dr. Mary Guinan reflects on 40 years as a disease detective for the CDC.

Candidates vying for president are talking a lot about trade. But trade is not a subject easily summed up in slogans. Here are resources to help you study up on trade and make your own decisions.

Leading candidates have tried to channel Americans' frustration when they talk about trade, but on the whole polls show Americans think trade has been good for the U.S.

Nearly 18 inches of rain has fallen on parts of the Houston area in two days. In the state's biggest city, schools are closed and subdivisions have flooded. More rain is predicted for Tuesday.

Twenty-one years ago, Garland — now nominated to the Supreme Court — supervised the investigation following the bombing that killed 168 people.

In 1973, in a 5-4 vote, the U.S. Supreme Court ruled there's no right to equal school funding in the Constitution. But plaintiff Demetrio Rodriguez's legacy lives on — in his daughter, a teacher.

To show that the water from Flint, Mich., is safe when filtered, the governor says he'll be drinking it for the next 30 days at home and at work. The city has been grappling with lead contamination.