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Marathon runners consistently finished slower in cities with higher levels of dangerous particles in the air, researchers found.

Touting new weapons tests, Moscow signals to Washington that it must contend with the Kremlin’s power and negotiate.

The meeting between Prime Minister Mark Carney and Xi Jinping, China’s top leader, came after a long period of tension and estrangement.

The crown prince of Saudi Arabia is pushing for a security pact and a nuclear deal with the United States yet is not expected to recognize Israel soon, despite President Trump’s wishes.

Daylight saving time ends tomorrow. The decrease in daylight can be destabilizing — and clarifying.

Zohran Mamdani, the leading contender in the Nov. 4 New York election, and Sadiq Khan, London’s mayor, are liberal and Muslim, but they’re navigating varied politics, communities and cities.

President Trump and the Chinese leader Xi Jinping are being described as “irreplaceable” and “world class leaders” before a meeting seen as critical for shoring up a trade truce.

Election monitors and members of the European Parliament have questioned the election’s integrity, and violent protests have rocked the country.

The president signaled he would discuss the sale of Nvidia’s Blackwell chips in a summit on Thursday, a move U.S. officials warned would be a “massive” national security mistake.

Not all states have gotten hit equally hard. The reasons are complex.