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Why we probably live in a quantum multiverse

The once-fringe quantum Many Worlds theory now seems much more likely

A graphic explainer of uranium enrichment

Inside the process of isolating uranium-235

Why data centers are reviving solid-state transformers

Solid-state transformer designs have been around for decades. Now data centers may finally give the chip-filled devices their killer application

Readers respond to the June 2026 issue

Letters to the editors for the June 2026 issue of Scientific American

What actually makes ultraprocessed foods unhealthy?

Scientists can't figure out why ultraprocessed foods are unhealthy for us—and new studies suggest that the "processing" isn't the problem

These extreme cosmic explosions are breaking physics

Astronomers are finally figuring out what powers mysterious gamma-ray bursts

How your brain learns to cope with uncertainty

Can our "prediction machine" brains learn to handle a world in chaos?

Science crossword: Scroll bars

Play this crossword inspired by the November 2026 issue of Scientific American

We’re addicted to social media. How do we get sober?

How doctors, scientists and "anonymous" programs are working to free people from their phones

The Selfish Gene at 50

A half century ago The Selfish Gene by Richard Dawkins became an instant bestseller and transformed public awareness of evolutionary biology. Today scientists are still debating its core message

Scientists left in the dark by National Science Foundation grant application delays

The Major Research Instrumentation program offers grants of up to $4 million to scientists buying or developing research equipment

Green stars do exist—and others shine pink or purple, too

The colors of dead stars come in a surprising rainbow of choices

Start-Up Claims to Treat a Patient With A.I.-Created Viruses

CARL ZIMMER

Certain viruses attack bacteria and can sometimes clear antibiotic-resistant infections. Researchers said they had tailored a virus to attack one patient’s illness.

Where Do Autoimmune Diseases Come From?

DAVID QUAMMEN

Our genes evolved to fight ancient threats, but in the modern world, some of those changes may be turning against us.

The mathematical impossibility of making a perfect world map

Mapping a sphere onto a flat plane is mathematically impossible. But a better world map than the Mercator projection is