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Oxygen is a precious resource for dolphins. A new study suggests they use it efficiently by remembering what they learn during a dive, then applying that information to future foraging expeditions.

In 2015 and 2016, the number of pedestrians killed in the U.S. increased significantly. In 2017, the number held steady at nearly 6,000 estimated fatalities, according to a new report.

The International Olympic Committee says remaining test results from Russians who competed at the Pyeongchang Winter Olympics have come back negative. 168 Russians took part as neutral athletes.

NPR's Ari Shapiro speaks with Washington Post reporter Sally Jenkins about the resignation of U.S. Olympic Committee chief executive Scott Blackmun, who cited health problems due to prostate cancer as his reason for stepping down, but there have also been calls for his resignation for not doing enough to address the sexual abuse cases within the U.S. Olympics gymnastics team.

Walmart, the largest retailer in the U.S., announced it will stop selling guns and ammunition to anyone under 21. The decision comes on the same day that Dick's Sporting Goods said it would stop selling military-style semi-automatic rifles and high-capacity magazines, as well as guns to anyone under 21.

German media report that the Kremlin-linked hacking group placed malware in a key government network that may have gone undetected for as long as a year.

The Founding Fathers were willing to be edited, it seems, but they did not want it to be easy. So they made the amending process a steep uphill climb, requiring a clear national consensus to succeed.

A 7.5 magnitude earthquake struck in the country's isolated interior on Monday, triggering landslides. Days later, rescuers are still working to reach some remote communities.

Stream 100 great songs by artists who performed at SXSW 2018.

Ret. Marine Corps Gen. John Kelly said "one of the great honors" of his life was leading the Department of Homeland Security.