How did the possibility of sterile neutrinos even become a thing? It all dates back to the so-called “solar neutrino problem.

A 430-million-year-old fossil reveals that the first leeches were ocean predators, not bloodsuckers. The discovery radically shifts the timeline of leech evolution by more than 200 million years.

Some 4.6 billion years ago, Earth was nothing like the gentle blue planet we know today. Frequent and violent celestial impacts churned its surface and interior into a seething ocean of magma—an ...

The tiny pantheon known as the Asgard archaea bear traits that hint at how plants, animals and fungi emerged on Earth.