
‘Dueling Dinosaurs’ Fossil Solves the Mystery of a ‘Mini T. rex’
An analysis suggests Nanotyrannus is a separate, smaller dinosaur that lived alongside T. rex, settling a 30-year debate

‘Dueling Dinosaurs’ Fossil Solves the Mystery of a ‘Mini T. rex’
An analysis suggests Nanotyrannus is a separate, smaller dinosaur that lived alongside T. rex, settling a 30-year debate
How an Error in Cult Classic Game Doom Sparked New Appreciation for Pi
The Neuroscience behind the ‘Parenting Paradox’ of Happiness
Here’s How a Nuclear-Powered Cruise Missile Works
Expert Sudoku: October 30, 2025

Glowing Sperm Reveals How Female Mosquitos Control Sex
The Abortion Pill Is Safe. Scientists Fear an FDA Investigation Will Ignore Science
Is It Time to Classify Hurricanes as Category 6?
Spooky Web Patterns May Help Spiders Sense Prey
Announcing the #SciAmInTheWild Photography Contest Short List
One Year after Scientific American’s First Issue, the Solar System Grew by a Planet
Scientific American Celebrates 180 Years with Stories of Scientific U-turns
U.S. Science and Scientific American Have Weathered Attacks Before and Won

Create as many words as you can!
Stretch your math muscles with these puzzles.

The Brain Science of Elusive ‘Aha! Moments’
Building Intelligent Machines Helps Us Learn How Our Brain Works
Lifting the Veil on Near-Death Experiences
How the Brain ‘Constructs’ the Outside World
Mosquitoes Invade Iceland, Earth Darkens, and Bird Flu Returns
Why Pregnant People Are Left Out of Drug Safety Studies
Why Some Apologies Feel Hollow—And Others Don’t
Global Superbugs Surge, Chikungunya Hits Long Island, and Satellites Leak Data

This New Shape Breaks an ‘Unbreakable’ 3D Geometry Rule
The noperthedron has a surprising property—which disproves a long-standing conjecture

UFOs Are Just One Explanation for Mysterious Patterns in Old Telescope Data
New peer-reviewed research reporting strange lights in the pre-space-age sky is sparking curiosity and controversy

Hurricane Melissa Images Reveal a Monster Storm for the Record Books
These images of Hurricane Melissa show the Category 5 storm in all its power

Can We Bury Enough Wood to Slow Climate Change?
Wood vaulting, a simple, low-tech approach to storing carbon, has the potential to remove 12 billion tons of carbon dioxide from the atmosphere every year—and some companies are already trying it

Here’s How a Nuclear-Powered Cruise Missile Works
Russian leader Vladimir Putin claimed his nation conducted a successful flight of a nuclear-powered cruise missile. Here’s how that missile might work

The Neuroscience behind the ‘Parenting Paradox’ of Happiness
Separate brain processes cope with moment-to-moment versus big-picture experiences, which helps explain how parenting both increases and decreases aspects of well-being