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See last night’s ‘blood moon’ eclipse from around the world

In a near-total lunar eclipse, the moon turned red-orange for viewers in North America, Europe and Africa

Alpha School’s AI teaching model is expanding. Does it work?

The fast-growing private-school network is handing much of instruction over to artificial intelligence. Researchers say the science is far from settled

Top 10 Roman Space Telescope science breakthroughs

NASA's Roman Space Telescope will open a whole new window on the cosmos. Here are 10 things it's likely to show us

F.D.A. Approves the Drug Daraxonrasib That’s Poised to Transform Pancreatic Cancer

GINA KOLATA, REBECCA ROBBINS AND CAROLYN Y. JOHNSON

In a key clinical trial, patients who got the pill, daraxonrasib, lived twice as long as those who got chemotherapy.

An Experimental Single-Time Treatment Slashed Cholesterol for a Year

CAROLYN Y. JOHNSON

A small gene-editing study significantly reduced LDL cholesterol levels, and the results have stuck a year later.

Dolly Parton’s Other Legacy: A Fortune Given Away, Dollar by Dollar

DAVID GELLES

The country star supported early childhood literacy, disaster relief, the development of the Covid-19 vaccine and more.

A.I. Brings Big Gains to Hurricane Forecasts, Google Researchers Say

WILLIAM J. BROAD

Analysis by the company’s DeepMind unit suggests that an A.I.-enabled model delivers accurate forecasts a day or more before conventional models can.

NASA’s Nancy Grace Roman Telescope Promises a Breakthrough in Cosmic Exploration

KATRINA MILLER

NASA’s latest offering to the stars comes from a legacy of great observatories that enabled decades of discovery and unearthed new mysteries about the universe.

Narwhals Have Stunning Spiraled Tusks. That’s Not the Only Twist.

TAYLOR MITCHELL BROWN

X-rays revealed that the tusks have an internal opposing twist, which may help explain how they grow so straight — the only tusks like them in nature.

A Melting Glacier in Nepal Was a Time Bomb. There Are More to Come.

JASON GULLEY

A geologist reflects on the disaster and explains why rapid warming will make deadly glacial floods far more common.

Where are all the aliens? A new book explores possible answers

Seven Rasmussen, an astrobiologist and author of the new book Cloudy with a Chance of Starships, gives readers a tour of the astonishing science behind modern searches for alien life

Army Awards $2.2 Billion for ‘Microreactors’ On U.S. Bases

BRAD PLUMER

The move is part of the Trump administration’s efforts to spur the country’s largest expansion of nuclear power in more than three decades.

Why your ability to cope with stress changes with time

Seasonal changes have more effects on your biology and behavior than you might realize

NASA’s Roman Space Telescope could find alien Earths—but not like you think

The Roman Space Telescope will spend more than a quarter of its time staring at the Milky Way's bulge, a star-packed central region of our galaxy that may swarm with small, rocky exoplanets

Mount Everest Base Camp Is Melting. Human Urine Is a Contributor.

ADAM POPESCU

More than 6,000 liters are produced daily by thousands of climbers and guides, according to a study.