You’ll find circles in lots of slides in Microsoft PowerPoint, but what you might not see as often are circles filled with two different colors. You might think, “Use semi-circles!” but guess what? A ...

The circle-shaped objects in the image above are cobalt-porphyrin-phospholipid (CoPoP) nanoparticles decorated with flu proteins. Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy ...

An unusual visitor cruised through the solar system in late 2017—a small, rocky object that did not hail from Earth’s neighborhood, but was born in a star system far, far away. The interstellar ...