Two studies fill in gaps about the cosmos’s ordinary matter. One maps it all, even the “missing matter.” The other details one of its hiding spots.

For only the third time in history, astronomers have detected a new interstellar visitor — an object from another star — blitzing into our solar system.

The vanilla species grown for its flavoring is finicky. Genes from its wild relatives could help make it hardier — but not if those cousins go extinct.

The whales use quick body movements to tear pieces of bull kelp for use as tools, perhaps the first known toolmaking by a marine mammal.

AI models such as ChatGPT consume serious power. Experts break down where that energy goes, and what you can do to help.

Algae grown under Mars-like conditions could make bioplastic building materials for structures to harbor life in space.

In a small cell therapy trial, 10 out of 12 people with type 1 diabetes no longer needed supplemental insulin, even a year after treatment.

A key advisory group vows to base decisions on evidence, boost confidence in vaccines and protect health. Experts fear the opposite is happening.

The system contains a sensor, chip and tiny AI model inspired by biological eyes and brains and uses a tenth of the energy of a camera-based system.

Layoffs at the FDA, USDA and CDC could erode the U.S. food safety system. Experts aren’t so worried about milk or chicken today; they’re concerned about the future.

Art and literature hint at past people’s psyches. Now computers can identify patterns in those cognitive fossils, but human expertise remains crucial.

Exploding stars V462 Lupi and V572 Velorum are best seen from the Southern Hemisphere. One has been spotted from the United States.