State biologists say a white sludge coating a North Raleigh Creek that dumps into Falls Lake is dead algae, but that the reason why it is in the creek is still a mystery. Residents in the nearby ...

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 ...

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 ...

Snow isn't always white; algae can make it look green, red, or orange, and scientists are trying to understand how and why these colorful patches appear.