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NPR's Lulu Garcia-Navarro talks to Ed Stone, a chief scientist at NASA, about the Voyager program as it approaches its 40th anniversary. He's 81 years old and has spent half his life on the project.

President Trump says he intends to impose stiff tariffs on imported steel and aluminum. Many experts say the costs of such a policy will far outweigh the benefits.

Vice President Mike Pence and Defense Secretary James Mattis talked at the Munich Security Conference this week. They reinforced the U.S. commitment to NATO and asked other countries to spend more.

Top overall seed Louisville will face Wichita State at the Georgia Dome next Saturday, while Michigan takes on Syracuse in the other national semifinal. The winners advance to the April 8 championship.

The secretary of Agriculture says if the sequester cuts go into effect, he'll have to furlough food safety inspectors. What would that mean for food companies and consumers?

Inspired by a TED talk, Winston Chen quit his software job and moved from Boston to a tiny Norwegian island with his wife and kids. He spent the year enjoying the outdoors with his family and writing an iPhone app, something he would never have done without his self-imposed sabbatical.

More than 600,000 have been left homeless and hungry by the devastating storm. In response, humanitarian agencies are mounting the largest relief operation since the Haitian earthquake in 2010. The biggest challenge right now is getting the basics — clean water and food — to the hardest hit areas.

Zimbabwe has begun moving more than 2,500 wild animals to rescue them from drought, as the ravages of climate change replace poaching as the biggest threat to wildlife.

There are few rules about heat in the nation's prison cells. As temperatures rise, advocates say the situation is becoming more and more dangerous.

Catch up on key developments and the latest in-depth coverage of Russia's invasion of Ukraine.