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The U.S. has weapons in space

A high-ranking official announced yesterday that the U.S. military has deployed weapons into orbit to counter threats from Russia and China

Which million-dollar math problem could AI solve next?

After an OpenAI model presented a possible solution to the Navier-Stokes problem, mathematicians are speculating about which major unsolved question could be resolved next

How pizza can solve this unusual math puzzle

Moser's circle problem can be used to divide a pizza into one, two, four, eight, 16 or 31 slices. It's a perfect example of how the numbers in a sequence aren't as clear-cut as they may first appear

Disaster Survivors Sticking Together

DAVID GELLES

We found grace, humanity and friendship in the stories of disparate Americans hit by climate chaos.

Harold Freeman, Who Helped Remove Barriers to Cancer Treatment, Dies at 93

RICHARD SANDOMIR

He developed a program that became a model for hospitals around the world, making it easier for poor Black patients to navigate an onerous bureaucratic system.

A T. Rex Walked Here: Teacher Finds Rare Footprints in North Dakota

ADEEL HASSAN

Kent Hups, a high school science teacher in Colorado, discovered a 23-foot trackway of fossilized dinosaur footprints, which offer a glimpse of how the apex predator moved 66 million years ago.

What even is an AI kill switch?

Amid renewed calls to slow frontier AI, experts are considering what an emergency stop would entail—and who would decide when to use it

Is There Anything Google’s Fruit Fly Brain Can’t Do?

MICHAEL LEVENSON

Models of the insect’s nervous system have been trained to solve a Rubik’s Cube, play video games and even parallel park a car.

FEMA Could Still Lose More Jobs Despite Court Ruling

SCOTT DANCE

A plan to halve the agency’s sprawling work force was illegal, a judge ruled. But the court is not blocking other FEMA cuts.

Whether Chemistry or the Cosmos, Always Looking at the Bigger Picture

VIVIAN EWING

The Times’s Science section is introducing new columns, projects and more as part of its online relaunch.

Exoplanets Offer Clues to What Lies Beyond Our Solar System

NATALIE WOLCHOVER

Thousands of planets have been discovered beyond our solar system, offering clues to where life might thrive and whether Earth is truly unique.

The hole in the ozone layer is healing, but extreme weather may be slowing progress down

Climate change, driven by humans, is making extreme weather more commonplace

Vox’s Unexplainable explores Scientific American’s biggest unanswered science questions

Rachel Feltman joins Vox's Unexplainable to discuss the enduring mysteries that continue to challenge science

Anthropic’s AI steals mathematicians’ record for most complicated curve

A search for the most complex elliptic curves has taken mathematicians years. Claude beat the record in days

Blood test shows promise in detecting pancreatic cancer early—a ‘holy grail’ for the field

Pancreatic cancer is typically caught in its latest stages, when it is hardest to treat