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How the Grand Canyon formed is a surprisingly messy story. Here's the latest clue

A new study suggests a proto–Colorado River filled a large basin before spilling westward to set the Grand Canyon's modern path

Astronomers just finished the biggest, sharpest 3D map of the universe—and it’s beautiful

A new map of the cosmos, including more than 47 million galaxies and other cosmic objects, represents one of the most extensive surveys of our universe ever conducted

Elizabeth Roboz Einstein—the determined genius behind a multiple sclerosis breakthrough

A Hungarian refugee who came to the U.S. with nothing but a diploma made a breakthrough discovery in the burgeoning field of neurochemistry

NASA Artemis II astronauts say thank you to the world

Astronauts Reid Wiseman, Victor Glover, Christina Koch and Jeremy Hansen reflected on the highs and lows of their moon mission—the first of its kind in more than 50 years

Congress grills RFK, Jr., about vaccines and cuts to health budget

The HHS secretary defended proposed budget cuts to science, his vaccine moves and health care costs on Capitol Hill on Thursday

Analysis of Alzheimer’s Drugs Stirs Debate About Their Effectiveness

PAM BELLUCK

The review said a certain class of drugs had little clinical benefit, but many Alzheimer’s experts criticized the analysis, saying it unfairly lumped failed drugs with two recently approved treatments.

Former deputy surgeon general Erica Schwartz nominated as new CDC chief

The White House has nominated Erica Schwartz to replace NIH director Jay Bhattacharya as CDC chief. Bhattacharya has been leading the CDC on an acting basis since February, after the public health agency's director was fired in 2025

Why birds were the only dinosaurs to survive Earth’s worst day

How a few unique traits helped modern-style birds—the last living dinosaurs—survive the asteroid apocalypse that took out T. rex and other mighty beasts

Mars orbiter watches mysterious wave of darkness spread across red planet’s surface

Observations by the Mars Express orbiter reveal rapid changes on the Red Planet's surface from windblown volcanic ash

AI music is reviving the same fights that shaped the player piano

As AI songs get harder to tell apart from human-made music, an older technology offers a revealing preview of the fight over artistry, labor and pay

How your body and brain construct chronic pain

Author Rachel Zoffness breaks down why we have chronic pain and how science shows that it's all in our head

Songbirds reveal the dark side of making new brain cells as adults

A new study in songbirds might help explain why humans don't generate many new brain cells, called neurons, as adults

What is Mythos and why are experts worried about Anthropic’s AI model

The company says Mythos is too dangerous to release publicly. Cybersecurity experts agree the model's capabilities matter, but not all of them are buying the most alarming claims

What’s the weirdest planet in the solar system?

All the sun's planets are oddballs. But some are more so than others

Did AI just solve the mystery of one of El Greco’s most enigmatic paintings?

For years, art historians believed The Baptism of Christ was likely painted by El Greco with assistance from other artists. But new research suggests otherwise