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NASA Telescope Helps Scientists Find a New Type of X-ray Object

KENNETH CHANG

The discovery of “hypersoft” X-ray beacons could help solve some mysteries about the universe.

What does OpenAI’s blockbuster mathematics proof mean for the real world?

OpenAI's claimed proof of the Navier-Stokes problem is a mathematical tour de force, but any real-world applications may be years away—if they ever arrive at all

Why AI is speeding up scientific research but not lab experiments

A new report from Google, Google DeepMind and M.I.T. finds that researchers are using AI—a lot. It's just not helping as much in the lab

New Species of Cat Discovered for First Time in a Century

KATE GOLEMBIEWSKI

The species, called a tilcayo, is smaller than a house cat and lives in the cloud forests of the Andes Mountains in Bolivia.

Will A.I. Kill Us? Can It Hack My Bank Account? Your A.I. Questions Answered

CADE METZ, DYLAN FREEDMAN AND K. R. CALLAWAY

Nearly 1,000 readers sent us their questions about artificial intelligence, its potential and its potential risks.

Video Shows a San Diego Dog Seeming to Greet an Intruder. Why Didn’t He Bark?

MICHAEL LEVENSON

Dog behavior experts offered a variety of explanations for why Nash the golden retriever wagged his tail and carried a toy near a man who broke into his owner’s home.

Mothers’ Intrusive Thoughts Are Mostly Benign. Lindsay Clancy’s Case Is an Exception.

ELLEN BARRY

Experts say that after childbirth, intrusive thoughts are common and mostly benign. Lindsay Clancy’s story provides a disturbing exception.

Could brain-inspired computers run on the same amount of power as a human brain?

The human brain uses about the same amount of wattage as a lightbulb

How Trump Has Disrupted National Parks

MAXINE JOSELOW

Maintenance projects have been put off around the country and resources diverted to the president’s favored projects in Washington.

Creating a Kill Switch to Shut Down a Rogue A.I. Is Harder Than It Sounds

DYLAN FREEDMAN AND DUSTIN VOLZ

A bipartisan group in Congress and Gov. Gavin Newsom of California have floated ideas for building a mechanism that would instantly power down an A.I. system. Only no one really knows how.