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See the First Complete Map of a Mammal’s Peripheral Nervous System in Stunning Detail

Global Birth Rates Are Falling, but the Answer Isn’t to Have More Babies

Deep-Sea Nodules May Produce Oxygen—Raising Concerns over Ocean Mining

SpaceX Successfully Launches Starship Spacecraft after String of Mishaps

Repeated Heat Waves Can Age You as Much as Smoking or Drinking

How Many Planets Orbit Our Nearest Neighboring Star?

Microplastics Could Be Creating Dangerous Antibiotic-Resistant Bacteria

Human Case of Flesh-Eating Screwworms Detected in U.S.

RFK, Jr., Demanded Study on Vaccines and Aluminum Be Retracted—The Journal Said No

The Way People Search the Internet Can Fuel Echo Chambers

180 Years of Scientific American Means 180-Degree Turns in Science—Here Are Some of the Wildest Ones

How AI Chatbots May Be Fueling Psychotic Episodes

The Brain’s Map of the Body Is Surprisingly Stable—Even after a Limb Is Lost

Why Do SpaceX’s Starships Keep Exploding?

Does Culture Change Visual Perception? Debunking the Carpentered-World Hypothesis

Climate Links to Dengue Will Allow Better Outbreak Predictions

Cash Rewards Have Less Sway in Collectivistic Cultures

Strange Deep-Sea Animals Discovered in Underwater Argentine Canyon

Will a Lunar Impact in 2032 Cause a Meteor Storm?

New Treatments for Peanut Allergies Offer Hope—Despite Lingering Questions

Carbon Dioxide Isn’t What You Think It Is

Controversial Quantum-Computing Paper Gets a Hefty Correction

OpenAI Model Earns Gold-Medal Score at International Math Olympiad and Advances Path to Artificial General Intelligence

How to Understand Hurricane Forecasts and the Cone of Uncertainty

Tropical Storm, Typhoon, and More—Your Guide to Hurricane Season Jargon

What to Know about Measles as the Outbreak in Texas Ends and the School Year Begins

Second U.S. Malaria Case Not Tied to Travel Raises Fears of Local Transmission

Tiny Probes Can Surf Sunlight to Explore Earth’s Mesosphere and Mars

Four Remarkable Stories from the History of Math Behind Bars

Nathan Lents’s New Book Explores How Animal Behavior and Evolution Challenge Binary Sex and Gender Norms

NASA’s James Webb Space Telescope Discovers New Moon of Uranus

Why Hurricanes like Erin Trigger Rip Currents Hundreds of Miles Away

U.S. Cuts Antarctica’s Only Research Icebreaker Ship under Trump Budget Squeeze

Why Some Smells Are Pleasant and Others Are Off-Putting, according to Science

What Happens When an Entire Scientific Field Changes Its Mind

We Thought DNA Ran Our Lives until We Discovered RNA Is in Charge

The Universe Keeps Rewriting Cosmology

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

Readers Respond to the April 2025 Issue

Poem: ‘Unison Call’

New Treatments Can Free Kids from the Deadly Threat of Peanut Allergy

In the Search for Life beyond Earth, the Only Constant Is Hope

Human Uniqueness Is a Myth, Mounting Evidence Shows

How Sleep Cleans the Brain and Keeps You Healthy

How Scientists Finally Learned That Nerves Regrow

How Plastics Went from a Sustainability Solution to an Environmental Crisis

How NASA’s Juno Probe Changed Everything We Know about Jupiter

How Gluten-Free Diets Are Getting Overhyped

Contributors to Scientific American’s September 2025 Issue

180 Years of Standing Up for Science