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2025’s Scientific Landscape Upended as Federal Overhauls, Public Health Setbacks, Climate Rollbacks and Cosmic Surprises Collide

A look back at 2025's biggest science stories—from federal upheaval and public health setbacks to climate policy reversals and groundbreaking discoveries in space.

Ancient Romans Guarding Hadrian’s Wall Were Riddled with Worms and Parasites

Romans living in ancient Britain were plagued by intestinal parasites, all of which are spread by fecal contamination

Will There Be a White Christmas This Year? It Depends on Where You Live

Are you dreaming of a white Christmas? The odds of snow on the big day comes down to a mix of climate and weather, scientists explain

Trump Administration Targets Offshore Wind Farms, Citing National Security Concerns

The U.S. Department of the Interior announced it would "pause" leases for five large offshore wind farms, imperiling the fast-growing clean energy industry

The Best Space Photos of 2025 Reveal the Most Jaw-Dropping Views of the Cosmos

From an interstellar comet to breathtaking auroras and from brand-new rockets to iconic space telescopes, here are some of our favorite images from the cosmos in 2025

This City’s Best Winter Show Is in Its Pitch-Dark Skies

THE NEW YORK TIMES

A heritage of dark sky preservation means residents of Flagstaff welcome the season’s longer nights with prolonged views of the stars.

Why Scientists Are Performing Brain Surgery on Monarchs

ALEXA ROBLES-GIL, LEILA MEDINA, JOEY SENDAYDIEGO AND MARK FELIX

Scientists in Texas are studying monarch butterflies to understand how they navigate thousands of miles, possibly by sensing Earth’s magnetic field. Alexa Robles-Gil explains how researchers are examining the butterflies’ brains to find answers.

Spectacular Cosmic Collision Captured in New Hubble Image

NASA's Hubble Space Telescope captured asteroids crashing into one another in a nearby planetary system around a star some 25 light-years away

10 Transformational Health Discoveries of 2025

From advancements in male birth control to the science of supplements, Scientific American highlights some of the most fascinating health and medicine stories of 2025