Quick question. What color is snow? If you said white, well, of course, you're right. But here's something you might not know. Sometimes snow can look green or orange or red because patches of snow ...

Scientists use computer models to project how hot earth will get as humans burn more oil and gas. But it turns out those models have a bit of a blind-spot: exactly how much of the sun’s energy gets ...

Some of you may be looking out the window right now at a beautiful blanket of white snow. But did you know sometimes snow can look green or orange or red? Here's a story from NPR's Nell ...