In a screenshot of a since-rescinded document, obtained by NPR, titled "EducationUSA Messaging Guidance: "America First," employees were encouraged to avoid phrases in their external and internal ...

Luckily, though, there's Mars. "Mars is a screenshot of the early Earth," Sellam says. "Basically, what Mars looks like right now is what was the Earth looking like four billion years ago.

Searching for small fossils in big rocks requires specialized tools --tools that scientists could also use to look for evidence of life on Mars in... In a way, it all started with a road trip ...

Welcome to Nat Geo Your Shot: National Geographic’s global community for aspiring visual storytellers. Find the community on Instagram @NatGeoYourShot and follow along for hashtag challenges ...

In a screenshot of a since-rescinded document, obtained by NPR, titled "EducationUSA Messaging Guidance: "America First," employees were encouraged to avoid phrases in their external and internal ...

Luckily, though, there's Mars. "Mars is a screenshot of the early Earth," Sellam says. "Basically, what Mars looks like right now is what was the Earth looking like four billion years ago. Of course, ...