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NPR's Ailsa Chang speaks to mathematician Eugenia Cheng about the Pascaline -- a 17th-century invention credited as the first mechanical calculator.

Ukrainian President Volodymyr Zelenskyy addresses the U.N. General Assembly, as diplomats struggle to stop Russia's aggression.

With a tap of their head, players will be able to trigger an automated review when they disagree with an umpire's call. In spring training this year, just over half of challenges were successful.

California is seeing a spike in cases valley fever — an illness spread by fungal spores. Researchers speculate the rise is tied to patterns of drought and precipitation.

NPR's Sergio Martinez-Beltran has the latest update from Dallas, where four people were shot at an ICE detention facility Wednesday morning.

Lara Friedman was walking her large rottweiler on July 4 when fireworks went off. Her dog went into panic mode. Then a stranger offered to help, ensuring both got home safely.

In parts of Western Pennsylvania, steel plants are big employers – and big polluters. This summer, the Trump administration paused regulations that would have forced steel mills to curb air pollution.

In parts of Western Pennsylvania, steel plants are big employers – and big polluters. This summer, the Trump administration paused regulations that would have forced steel mills to curb air pollution.

A restaurant recycling program in Southern California is helping divert food waste from landfills while restoring oyster beds along the shoreline.

Researchers are calling for greater recognition of an obscure form of malnutrition-related diabetes. This year, the International Diabetes Federation gave it an official classification.