Earth may be habitable because it got unbelievably lucky with its chemistry from the very start.

Earth may have won a cosmic chemistry lottery. Researchers found that during the planet’s earliest formation, oxygen had to be in an extremely narrow “Goldilocks zone” for two life-essential elements, phosphorus and nitrogen, to stay where life could use them. Too much or too little oxygen, and those ingredients could be lost or trapped deep inside the planet. This could reshape the search for life by showing that water alone is not enough.

Life cannot begin on a planet unless certain chemical elements are available in large enough amounts. Two of the most important are phosphorus and nitrogen...

A research team led by scientists from the State University of Campinas (UNICAMP) in São Paulo, Brazil, has made significant progress in understanding the relationship between gut microbiota and intestinal cells. The study, published in the journal Gut Microbes, showed how microbiota and the compounds it produces, such as butyrate, influence the functioning of cells that line the large intestine...

Guide dogs are powerful allies, leading the visually impaired safely to their destinations, but they can’t talk with their owners—until now. Using large language models, a team of researchers at Binghamton University, State University of New York has created a talking robot guide dog system that determines an ideal route and safely guides users to their destination, offering real-time feedback along the way.

The paper, “From Woofs to Words: Towards Intelligent Robotic Guide Dogs with Verbal Communication,” was presented at the 40th Annual AAAI Conference on Artificial Intelligence (AAAI 2026)...

The closest planet to our sun, Mercury, experiences extreme temperature variations. Since the planet has no atmosphere to speak of, it is in a constant cycle where one side is extremely hot and the other extremely cold. On the sun-facing side, temperatures reach a scorching 427°C (800°F), enough to melt tin and lead, and the surface is exposed to extremely lethal levels of radiation. On the night side, temperatures plunge)] to a chilling −173°C (-279.4°F), cold enough to freeze most liquids, including those used in battery manufacturing.

All of this makes exploring Mercury’s surface very challenging...