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Oldest Known Pachycephalosaur Fossil Discovered in Mongolia

New Research Shows Gut Cells Communicate Directly with the Brain

Climate Change Fuels Record Summer Heat, Killing Thousands

Ozone Layer Recovery Continues under Montreal Protocol

Weird ‘Time Crystals’ Are Made Visible at Last

The Quiet Demise of Breakthrough Starshot, a Billionaire’s Interstellar Mission to Alpha Centauri

The Problem with Billionaire Science

Science Crossword: A Little Light Launch

Readers Respond to the May 2025 Issue

Poem: ‘Love Letter from Photograph 51’

October 2025: Science History from 50, 100 and 150 Years Ago

New Hope in Alzheimer’s Research: A Special Report

New Alzheimer’s Blood Tests Promise Early Detection but No Clear Path Forward

Math Puzzle: Find the Unknot

How Three Fusion Reactor Designs Could Power Tomorrow

How Racial Discrimination and Pollution Increase Alzheimer’s Risk

How Climate Change Is Increasing Landslide Risk Worldwide

How Birds Began Migrating to the Arctic to Breed

Fast Fashion Is a Bad Look for the Environment

Dead Trees Hide a Complex World Crucial to Forest Ecology and Climate

Controversial New Alzheimer’s Treatments Gain Ground despite Serious Side Effects

Contributors to Scientific American’s October 2025 Issue

Can Dogs, Cats and Other Pets Truly Improve Your Health?

Can Diet and Exercise Prevent Alzheimer’s Disease? What the Research Says

As Memory-Care Facilities Close, America Faces a Crisis in Alzheimer’s Care

A New Generation of Alzheimer’s Treatments, Explained in Graphics

CDC Panel to Review Childhood Vaccines: What's at Stake

Nixing Daylight Saving Time May Lower Risk of Obesity and Stroke

Most Countries Are Reducing Deaths from Heart Disease, Cancer and Diabetes

Mondays Really Are More Stressful on the Brain and Body

Freaky ‘'Rubber Hand’ Illusion’ Works on Octopuses, Too

COVID Deaths Decline, but Vaccine Access Remains Uneven in the U.S.

Scientists Map Nightlife and Communication of NYC Rats to Help Urban Planning and Pest Control

Measles Death Shows How Virus Can Hide in the Brain for Years

Forensic Expert Explains How 3D Laser Scanning Could Reconstruct the Charlie Kirk Shooting

Is Intermittent Fasting Helpful or Harmful?

NASA’s JWST Hunts Dark Matter in Stunning Image of Bullet Cluster

Daniel Yon Explains Why Your Brain Is a Brilliant Illusionist

Polar Geoengineering Debate Rages as Climate Change Melts Ice

Magic Mushroom Edibles Found to Contain No Psilocybin

Frances Glessner Lee, the Mother of Modern Forensic Science, Made Crime Scene Dioramas

Big Oil Companies Caused about 25 Percent of Heat Waves since 2000

Early Experiments Show Fast-Acting Antidote Targets Carbon Monoxide Poisoning

How to Send Your Name to the Moon with NASA’s Artemis II Mission

Is There Life on Mars? This Rock May Hold the Answer

Best-Yet Measurement of Merging Black Holes Confirms Einstein, Hawking and the ‘No Hair’ Theorem

Autism Has No Single Cause, Research Shows

Atlantic Hurricane Season Has Gone Quiet. Here’s Why

What Is Alpha-Gal Syndrome? Symptoms, Causes and Way to Get Tested

JWST Sees Hints of an Atmosphere on a Potentially Habitable Exoplanet