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The liberal Vermont senator is running to Clinton's left. Another candidate or two on the Democratic side might actually be a good thing for Clinton.

The international pressure on Iran's nuclear program was one of the rare examples of global cooperation in the past year. On most issues, like the war in Syria, the global community came up short.

A video from NASA shows how air pollution moves around the world. So what happens when emissions from Asia blow across the Pacific Ocean to North America?

NPR's Don Gonyea speaks with UNICEF spokeswoman Alice Clements about the situation in Vanuatu. A cyclone tore through the South Pacific island nation this weekend.

Three spices that grow on the island of Zanzibar are so common they might be flavoring your morning cup of coffee. But vanilla, cinnamon and nutmeg have very different origins.

The U.S. Navy has completed the largest robotic survey of the Arctic ever attempted. Warming waters are absorbing more sunlight and melting more ice there each summer, the gizmos and gliders suggest.

Every year, the president sits down for dinner with Washington reporters and delivers a standup routine. From his "bucket list" to Hillary Clinton, here's what he came up with this year.

The British government has long been concerned about extremism emerging within its borders. Linda Wertheimer talks to Shashank Joshi of the Royal United Services Institute about extremism.

Scientists believe the project, which is reportedly underway already, could destroy a million acres of rainforest and contaminate Central America's largest source of drinking water.

Several of the world's largest brewers are being sued for suggesting their beers are imports. Anheuser-Busch settled a class action suit that will require it to pay out millions of dollars.