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These devices measure blood oxygen levels and can help identify when patients are dangerously ill. But research shows they can deliver misleading results for people with darker skin.

Not just for the super fit, gravel bike racing has exploded into one of the most popular forms of biking in the U.S. Organizers have worked so that everyone feels included and welcome.

Festival promoters are allowing lifesaving medication as fentanyl deaths surge, but volunteers are often left to distribute it, and more controversial forms of harm reduction aren't openly allowed.

The women's race starts Sunday in Paris and lasts for 8 stages, ending July 31. The last multiday women's race was held in 1989.

From 2017 to 2021, Sir Mark Lowcock was the U.N.'s "relief chief," the world's most senior humanitarian official. He talks to NPR about what inspired him and why crises are getting worse.

In Guatemala's mosquito-plagued lowlands, researchers use a novel tool — they call it an "insectazooka" — to suck up mosquitoes. Then they peer at the blood meal, searching for unknown pathogens.

As fentanyl deaths soar, political pressure is growing to stop Mexican cartels that smuggle the drug. Experts on drug trafficking say trying to lock down the Mexican border is an impossible goal.

House Republicans make up the majority in the House of Representatives for the 118th Congress. Here's a rundown of the lawmakers likely gaining power in key panels at the beginning of the new year.

County election supervisors say the new restrictions will create significant election reporting delays and a slew of costs for local election offices, and could disenfranchise large numbers of voters.

The hit video app is facing an existential crisis, and it is hoping promoting its reorganization will help convince Americans that it is independent from its Chinese owner.