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Canada is having its second worst wildfire season yet. Two scientists explain what a red air alert means and how anyone living in impacted areas can protect themselves.

The White House said that starting just after midnight that goods from more than 60 countries and the European Union would face tariff rates of 10% or higher.

Jen Pawol will make history by becoming the first woman to umpire a Major League Baseball game. Here's a look at other female officials who were the first on the floor, court or the field in prominent men's leagues.

Hundreds of United Airlines flights were disrupted on Wednesday evening as the carrier grappled with a major computer system outage. The airline requested ground stops at its major hubs in the U.S.

The Aalborg Zoo in Denmark said it would take certain surplus pets such as chickens, rabbits and guinea pigs to be "gently euthanized" and fed to its captive predators.

More than 500 former officials who once led Israel's military and security agencies are asking President Trump to help stop the war in Gaza. NPR's Ailsa Chang speaks with one of them.

Smoke from Canadian wildfires continues to bring poor air quality into the Northeast U.S. and the Upper Midwest. And the exposure to wildfire smoke remains a growing health problem.

Children are increasingly being targeted online by violent, predatory networks that groom them into harmful behaviors. One mother whose son fell under their influence shares her family's experience.

The Trump administration canceled about $500 million for research into mRNA vaccines. The move slows progress in using the technology to prevent a future pandemic or treat disease, experts say.

Florida has been experiencing a statewide teacher shortage made worse by the pandemic and low teacher pay.