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OpenAI Rejects Elon Musk’s $97.4 Billion Bid for Control of the Company

Bret Taylor, the chairman of OpenAI’s board, said the artificial intelligence company was β€œnot for sale.” Mr. Musk is separately raising money for his A.I. start-up, xAI.

Β© Jim Wilson/The New York Times

Bret Taylor, the chairman of the OpenAI board.

Apple and Google Restore TikTok to App Stores in the U.S.

The popular social media app was removed to comply with a new law that banned it in the United States. President Trump has paused enforcement of the ban.

Β© Ore Huiying for The New York Times

Before bringing TikTok back, Apple and Google wanted to be certain they would not be breaking a federal law.

Banks Sell $4.7 Billion of X’s Debt, in a Sign of Investor Demand

The social media company is attracting investor interest because of Elon Musk’s close ties to President Trump and a recent jump in revenue.

Β© Eric Lee/The New York Times

Investors believe Elon Musk’s debt is more likely to be paid back now that he has a central role in the administration of President Trump, whom he joined in the Oval Office on Tuesday.

Prominent Cryptocurrency Investor Faces Senate Tax Inquiry

The Finance Committee’s top Democrat sent a letter last month to Dan Morehead, the founder of Pantera Capital, about the investigation.

Β© Xavier Garcia/Bloomberg

Dan Morehead founded Pantera Capital in the early 2000s and turned it into one of the largest investment firms focused on cryptocurrency.

With Trump’s Help, Intel Could Hand Control of Chip Plants to TSMC

The Silicon Valley giant is trying to cut a deal it hopes would help it pull out of a yearslong slump.

Β© Philip Cheung for The New York Times

An Intel chip-making site in Chandler, Ariz. The company is looking into splitting its manufacturing business from its semiconductor design and products business.

What’s Best, According to the Italian Mathematician Alessio Figalli

Alessio Figalli studies optimal transport, a field of math that ranges from the movements of clouds to the workings of chatbots.

Β© Michelle Gustafson for The New York Times

Alessio Figalli, a mathematician at ETH Zurich and a current member at the Institute for Advanced Study in Princeton, N.J., investigates β€œoptimal transport,” the study of starting points, end points and the paths between.

How Did DeepSeek Build Its A.I. With Less Money?

The Chinese start-up used several technological tricks, including a method called β€œmixture of experts,” to significantly reduce the cost of building the technology.

Β© Caroline Brehman/EPA, via Shutterstock

DeepSeek used several technological tricks to significantly reduce the cost of building its system.

Ford Chief Executive Says Trump Policies May Lead to Layoffs

The executive, Jim Farley, said President Trump’s tariff and auto policies would raise costs and could force the automaker to cut jobs.

Β© Sylvia Jarrus for The New York Times

Jim Farley, Ford’s chief executive, said β€œmany of those jobs will be at risk” if Republicans end billions of dollars in subsidies and loans for projects like the company’s factories that produce batteries and electric vehicles.

Chinese Companies Use Legal Threats to Halt Foreign Research

Think tanks and universities have helped expose problematic Chinese business practices. Now, those businesses are accusing them of defamation.

Β© Caroline Gutman for The New York Times

BGI, a Chinese technology company, accused Anna Puglisi of making defamatory claims when she was a researcher at Georgetown University.

Her Discovery Wasn’t Alien Life, but Science Has Never Been the Same

The internet erupted in controversy over Felisa Wolfe-Simon and colleagues’ claim of a microbe thriving on arsenic. Nearly 15 years later, she’s pursuing new research on the boundaries of life.

Β© Marissa Leshnov for The New York Times

Felisa Wolfe-Simon, a research scientist who presented findings in 2010 that suggested arsenic could be a building block of life.

What DeepSeek’s Success Tells Us About China’s Ability to Nurture Talent

China produces a vast number of STEM graduates, but it hasn’t been known for innovation. Cultural and political factors may help explain why.

Β© Costfoto/NurPhoto, via Getty Images

A student preparing for the 2025 national postgraduate entrance exam at Hebei University of Engineering in Handan, China, in December.
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