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Obama does it. And increasingly, so do folks around the world. Why is the fist bump so popular? And do other cultures have similar gestures?

It's hard not to worry about heart problems when running hard in hot weather. But heatstroke is a far bigger health risk, researchers say. Marathon organizers are trying to make races safer.

Native American groups are challenging the exclusive trademark protection for the Washington Redskins, saying the NFL team's name is a racial slur. If the judge rules in the groups' favor, the team could lose millions of dollars from the sale of licensed merchandise.

Mail-order foreign pharmacies became less popular after a 2006 law helped seniors get Medicare coverage for medications. But many seniors still have trouble paying for drugs. The Maine legislature just approved a new law so its citizens can once again order drugs from Canada and Europe.

Nobody knew how people in Southern California were getting infected with the life-threatening fungus C. gattii. A 13-year-old helped figure out the source: three types of trees.

Al-Qaida fighters are attacking police stations and local officials. Sunni militias, who have battled al-Qaida in the past, are exerting themselves in other parts of the city. Government forces have pulled back, allowing freedom of movement for fighters from all sides.

People are turning to mindfulness mediation to manage health issues. And researching are finding that ancient Eastern practice may offer measurable health benefits.

Emily Johnson Dickerson, the last person who spoke only Chickasaw, died last week at age 93. There were thousands of fluent Chickasaw speakers as late as the 1960s. Dickerson was among about 65 remaining.

A group of first responders who spoke to the news media, including NPR, about their experiences during the COVID-19 outbreak are suing the city after they were suspended or restricted from work.

The policy — which bars foreign students unless they have in-person classes — will "create as much chaos for universities and international students as possible," the schools said Wednesday.