December 6, 2021

It’s the most successful video app in the world. Our columnist has obtained an internal company document that offers a new level of detail about how the algorithm works.

The country regards children as crucial in its quest for herd immunity, but some parents, worried about the vaccines’ safety, are pushing back.

The automaker may have undermined safety in designing its Autopilot driver-assistance system to fit its chief executive’s vision, former employees say.

They are eyeing BuzzFeed’s market performance as they face a tough advertising climate and look for ways to pay back their early investors.

Farmers in India are desperate. Trucks in South Korea had to be idled. Food prices, already high, could rise even further.

The actor, who died at the age of 72, was known for his commanding performances of Shakespeare’s Richard III and the Auschwitz survivor Primo Levi.

After eight years in the trenches, Ukrainian soldiers are resigned to the possibility that the Russian military, which dwarfs their own in power and wealth, will come sooner or later.

In “The Shape of Things” at the Park Avenue Armory, the artist tells us how we got to this political moment, and asks us to decide what comes next.

American athletes will still be able to compete in the Winter Games, but the diplomatic boycott is a slap at China for human rights abuses in Xinjiang.

The department said the state’s redistricting plan would violate the Voting Rights Act by discriminating against minority voters.

A financing company told investors that it wasn’t in deal talks, weeks after its C.E.O. held a private videoconference about a possible deal with Donald Trump.

Researchers in South Africa, where the variant is spreading quickly, say it may cause less serious Covid cases than other forms of the virus, but it is unclear whether that will hold true.