Translating Uncle Sam

How floods happen, and how to be safe

What is the Great Pacific Ocean Garbage Patch?

What are the different types of lightning?

Are wildfires getting worse?

Which U.S. volcanoes are likely to erupt next?

Earthquakes: Finding fault with nature

De-icing dilemma: Do streets need salt?

Flaking out: How snow forms

How does the flu work?

Interactive: Explore the surface of Mars

Are grizzly bears becoming unbearable?

U.S. pipelines at a crossroads