Hi, I'm Soledad O'Brien and we're getting ready for the next leg of the matter of fact listening tour. It's all about what it means to be an American. If you're born here, you're a citizen. But could ...

In a groundbreaking cosmic test, researchers have discovered that dark matter behaves more conventionally than previously thought during galaxy interactions. This finding challenges earlier ...

This quiz dives into the mysterious world of dark matter — what we know, what we don't, and how scientists are chasing shadows across the cosmos. When you purchase through links on our site, we may ...

Students will learn how to categorize matter as either pure substances or mixtures. Students will apply tests, based on physical properties of matter samples, to determine whether a mixture is ...