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3-D Printing for Space Exploration

The Perils of Peanut Butter

The Elusive Giant Coconut-Cracking Rat of the Solomon Islands

Rosetta’s Lost Picture From Moments Before It Struck a Comet

Arming China’s Terracotta Warriors — With Your Phone

Who’s Eating Jellyfish? Penguins, That’s Who

Elon Musk Set to Update His Plans for Colonizing Mars

The Evolutionary Event That Gave You Pumpkins and Squash

After the Tsunami, Japan’s Sea Creatures Crossed an Ocean

The Mystery of the Dead Bumblebees and the Linden Trees

Colliding Black Holes Detected for the Fourth Time

215 Million Americans Watched the Solar Eclipse, Study Finds

A Deep Blue Vision of Earth From an Asteroid Hunter

How Dinosaurs Swapped Terrifying Teeth for Bird Beaks

Moths, Alive and in Color, in All Their Diversity

Pandas Are No Longer Endangered. But Their Habitat Is in Trouble.

Clues to Prehistoric Cave Painters Remain Scant

A Battle to Save the World’s Favorite Treat: Chocolate

Spelunking in Search of Antibiotics

Sputnik for Sale, if You’ll Settle for a Beeping Replica

Birds Beware: The Praying Mantis Wants Your Brain

How Dogs Recognize Their Scents — And Selves

Dogs Recognize Themselves in Test Based on Smell, Not Sight

A Glowing Cotton Study That Might Have Deserved Less Glowing Reviews

For Neanderthals, Growing Big Brains Took More Time

How Three Friends Proved That Jellyfish Can Sleep

Clues to Africa’s Mysterious Past Found in Ancient Skeletons

NASA’s Osiris-rex Spacecraft Is Headed for a Flyby With Earth

Sea Turtles Appear to Be Bouncing Back Around the World

Chemical Industry Ally Faces Critics in Bid for Top E.P.A. Post

Genes Color a Butterfly’s Wings. Now Scientists Want to Do It Themselves.

In Mexico, Weavers Embrace Natural Alternatives to Toxic Dyes

Three Planets Will Slide Behind the Moon in an Occultation

Back to Saturn? Five Missions Proposed to Follow Cassini

One Night a Year, This Cactus Flower May Surprise You

The Snow Leopard Is No Longer Endangered. It’s Still at Risk.

Cassini Is Gone. Here Are the Next Space Missions to Watch Out For.

Maurice Bluestein, Who Modernized the Wind Chill Index, Dies at 76

Cassini’s Grand Finale at Saturn: What to Expect

Testing an Electric Eel’s Shock Powers With His Own Arm

Cassini’s Mission to Saturn in 100 Images

Test Your Knowledge of Cassini and Its Grand Mission to Saturn

The Animals Most Threatened by Climate Change? The World’s Parasites

Nicolaas Bloembergen, Who Shared Nobel on Laser Light, Dies at 97

Lotfi Zadeh, Father of Mathematical ‘Fuzzy Logic,’ Dies at 96

What Swims Like a Duck and Quacks Like a Duck Could Be a Hybrid of Two Duck Species

Can You Pick the Bees Out of This Insect Lineup?

Shades of Noir: My Hunt for an Eclipse Glasses Villain

Europtics Eclipse Glasses Complaint

Amazon Eclipse Glasses Complaint