Canada said the higher levies, on items from aluminum foil to dishwashers to fish, would help protect workers, producers and manufacturers harmed by new Trump tariffs.

A judge exonerated Nancy Smith, an Ohio bus driver, after she was convicted of abusing children in her care. Now, prosecutors want to reverse an order saying she was innocent.

Irregular, an Israeli start-up, worked with OpenAI, Anthropic and Meta to assess the security of their A.I. models. It made a mistake. Then the tests went off the rails.

The Trump administration risks a clash with Beijing as it tries to cut off Iran’s economic lifelines without upending a fragile U.S.-China truce.

The actual prevalence, researchers said, may be much higher.

“We never see things that are this dire,” a former chief scientist of the agency said about rates of C.T.E. in former players.

A.I. could turn one of our country’s worst habits into a national security crisis.

Detailed accounts of the final hours of the negotiations show that, while the United States offered Canada what it said was the best deal of any country, what Canada had to give up in exchange was seen as unthinkable.

A new study shows that N.F.L. players have a high risk for developing degenerative brain disease. Does anyone in your family play football? We want to know your thoughts.

A new study underscores the danger of playing.

Researchers say it’s all about reducing the total number of blows to the head.

A New York Times/Philadelphia Inquirer/Siena poll found Gov. Josh Shapiro leading Stacy Garrity and having support in the state for a possible presidential bid.

Annie Lowrey, the author of “The Time Tax,” explains how the government steals Americans’ time — on purpose.

President Trump’s endorsement track record is on the line in two races, including the high-profile contest to succeed the late Senator Lindsey Graham.

The administration asked the court to clear the way for President Trump’s order that creates “state citizenship lists” and directs the Postal Service to decide who gets a mail-in ballot.