Translating Uncle Sam

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

White-nose syndrome haunts bats

How does the flu work?

Interactive: Explore the surface of Mars

Are grizzly bears becoming unbearable?

U.S. pipelines at a crossroads

What are rare earth metals?