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How many planets could fit in the solar system?

As far-fetched as it may seem, quirks of orbital mechanics could allow hundreds of planets to be packed around a star

Are you addicted to your phone? What scientists say about screen time and social media

Experts unpack the science of screen addiction and how to build a healthier relationship with technology

5 ways to make Halloween decorations friendlier to wildlife

You don't need to sacrifice spookiness to keep real owls, bats and snakes safe

Everything you need to know about flu season 2026

An early start doesn't necessarily mean disaster

Citizen Science Groups Grapple With the Rise of A.I. Slop

ERIC BOODMAN

Facing a flood of A.I. slop, groups bent on democratizing science create new checks and balances.

Here’s what scientists think about Theranos a decade after it imploded

A viral documentary has everyone talking about Elizabeth Holmes's fraudulent blood testing start-up again—but scientists never stopped

The Leap Second Has Been Canceled

K. R. CALLAWAY

Earth’s rotation subtly changes the length of the day. Now our clocks won’t change with it — at least not for a very long time.

Bleached Coral Rebounded After Touching Healthy Coral, Study Finds

RAYMOND ZHONG

After sick corals were placed in direct contact with healthy ones of the same genetic makeup, they recovered at “incredible” speed, scientists found.

Plants move to get away from their decaying brethren

A new discovery reveals how plants protect themselves from microbes in rotting material

RFK Jr. Pledged to Advance Anti-Vaccine Group’s Goals. Here’s What He’s Doing.

CHRISTINA JEWETT

The health secretary is quietly taking steps that public health experts fear will reduce immunization rates further.

A Reporter Who Saw Covid Coming Has Died

JERÉ LONGMAN

Helen Branswell recognized the threat of the pandemic ahead of the vast majority of journalists and even medical experts. She was 69.

For a Mere $2 Million, You Could Own Three Books That Unlocked the Universe

WILLIAM J. BROAD AND ANDRES KUDACKI

At Sotheby’s, a feast of rare science books includes volumes from Copernicus, Galileo and Newton that together revolutionized human understanding of the cosmos.