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In a test at the Idaho National Lab last week, workers were able to turn the reactor on and safely control a nuclear fission reaction, though it hasn't produced electricity yet.

Israel and Iran exchanged fire early Monday, escalating tensions and raising fears the conflict could pull the region back into a full-scale war.

NPR's Michel Martin speaks with Randa Slim of the Stimson Center about how the latest round of retaliatory strikes from Iran and Israel could affect the peace talks between the U.S. and Tehran.

Pope Leo XIV is in Spain, calling for an end to political polarization on his first papal visit to the country in 15 years.

In the first papal address to the Spanish legislature, the American pope said a "moral renewal" was necessary in legislatures and public life to ensure respect for the inherent dignity of all people.

A study finds that people in remote jobs are more socially isolated, anxious and sad compared to people not in remote jobs. But demanding everyone return to the office isn't the answer either, say researchers.

More than 40 million adults in the U.S. ages 50 and older have osteopenia, or low bone density. An FDA-approved wearable vibration device is giving some women a tool that could slow that loss.

Recent research suggests there's more going on with "ideological sorting" than simply moving to places that match one's politics. It's often one of many deciding factors, such as taxes or safety.

The changing climate is driving whales into San Francisco Bay, where ship strikes have been deadly. A new camera system could help ships and ferries steer clear.

Israel and Iran traded fire early Monday in retaliatory strikes, Trump walked out of an interview after being pressed on election fraud claims, ebola outbreak is spreading at alarming rate.