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If Mars Is Colonized, We May Not Need to Ship In the Bricks

6 Bots That Deliver Science and Serendipity on Twitter

Dr. Joseph Lifschutz, Who Asserted Confidentiality Right for Therapists, Dies at 92

Gary Steigman, Who Teased Out the Universe’s Dark Secrets, Dies at 76

Hunting Mushrooms, and What Makes Some Glow in the Dark

Cassini’s Images From Inside Saturn’s Rings

Ancient Horse DNA Shows Scythian Warriors Were Adept Domesticators

No Bones About It: Scientists Recover Ancient DNA From Cave Dirt

A Very Hungry Caterpillar May Help Slow Pollution, Researchers Say

Humans Lived in North America 130,000 Years Ago, Study Claims

Some Surprising Dog Breeds Have Ancient American Heritage

That Ghostly, Glowing Light Above Canada? It’s Just Steve

Peggy Whitson Breaks Another Record in Space

Watching Their Dust: Photographing Players in Pollination

As Rains Ease in the West, Cacti Shine Brighter Than Ever

Video Games Help Model Brain’s Neurons

People Are Seeing U.F.O.s Everywhere, and This Book Proves It

Trump Calls @AstroPeggy at the International Space Station

Pictures From the March for Science

Meet Three Scientists Ready to March

The March for Science: What You Need to Know

Cassini’s Grand Finale: A Dive Between Saturn and Its Rings

Cassini Moves Inside Saturn’s Rings

What Moves Gravel-Size Gypsum Crystals Around the Desert?

No Oxygen? The Naked Mole Rat Might Not Care

Asteroid Misses Earth Narrowly, by Cosmic Standards

Why Are Some Mice (and People) Monogamous? A Study Points to Genes

A New Exoplanet May Be the Most Promising Yet in Search for Signs of Life

Broke a Glass? Someday You Might 3-D-Print a New One

This Is a Giant Shipworm. You May Wish It Had Stayed In Its Tube.

Dinner With a Dung Beetle

The March for Science: Why Some Are Going, and Some Will Sit Out

Scientists and Activists Look Beyond the March for Science

Ranks of Scientists Aging Faster Than Other Workers

‘Genius’ Unravels the Mysteries of Einstein’s Universe

Avian Housing Wars: Competition for Nesting Spots

Climate Change Reroutes a Yukon River in a Geological Instant

Photos of Jupiter From NASA Spacecraft, Both Near and Far

Saber-Toothed Cats Paid a Stiff Price for Lunch

Silver Fish Surf the Waves to Spawn on California Beaches

Hints of Conditions for Life Detected in Plumes From Saturn Moon

A Lizard With Scales That Behave Like a Computer Simulation

Do Your Shoelaces Keep Coming Undone? Engineers Explain Why

Valiant in Battle, These Ants Rescue Their Wounded

A Dinosaur Cousin’s Crocodile Ankles Surprise Paleontologists

Riddle of Why Hitler Didn’t Use Sarin Gas Remains Unsolved

Valiant in Battle, These Ants Rescue Their Wounded

A Lizard With Scales That Behave Like a Computer Simulation

Saber-Toothed Cats Paid a Stiff Price for Lunch

How Ants Figured Out Farming Millions of Years Before Humans