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What caused this woman’s hallucinations? Doctors reveal an infestation of brain worms

After months of headaches and visual hallucinations, a woman was finally revealed to have brain cysts filled with tapeworm larvae

25 years after 9/11, AI sparks a math debate as data center pollution concerns grow

As new 9/11 documents emerge, AI transforms math and fuels debates over pollution, power and progress

25 winners of math’s ‘Nobel Prize’ decry the AI invasion of their discipline

A new declaration from winners of the Fields Medal reflects many mathematicians' growing alarm over a "severe misalignment" between the tech industry and their field a week after AI toppled one of math's biggest open problems

Global Warming Will Breach the 1.5 Degree Celsius Limit. Now What?

CHICO HARLAN

As global temperature increase shoots past 1.5 degrees Celsius, the vulnerable countries that fought for that Paris Agreement target face a brutal new reality.

An Armadillo Arrives in … Ohio?

VICTOR MATHER

Traditionally found in warm climates, like the American Southwest, armadillos have been migrating farther and farther north, researchers say.

Trump repeals emissions regulations of fossil-fuel power plants

The reversal of a Biden-era cap on emissions from the plants could have devastating effects in efforts to stop climate change

Mercury Is Shrinking, and Faster Than We Thought

K. R. CALLAWAY

New estimates using the planet’s surface wrinkles show that our smallest planet is growing even smaller, at a faster clip than expected.

Do You Have Questions About A.I.? We Want to Answer Them.

CADE METZ

The New York Times is soliciting readers’ questions about the dangers — and benefits — posed by artificial intelligence.

A Teen Autopsy Marks the Arrival of a Deadly Drug in San Francisco

HEATHER KNIGHT

City officials — and one determined mother — are working to stop the spread of cychlorphine, which is far more potent than fentanyl.

As Millions of Birds Migrate, Residents Are Asked to Turn Off the Lights

ISHANI DESAI

Birds are drawn to lights, and more than a billion die each year after crashing into buildings, experts said.