An analysis of long-term trends in the amount of mercury in rainfall and other forms of precipitation in North America found recent increases at many sites, mostly in the center of the continent. At ...

A long-dead tectonic plate is still reshaping the continent from below. The ancient Farallon plate, now deep in the mantle, is driving mantle flows that pull down pieces of North America’s lithosphere ...

It might come as an otter shock to some— part of the newly renovated North America trek region at the Columbus Zoo & Aquarium ...

However, it can also be seen from North America, close to the southern horizon, just after sunset. Amateur astronomers from the U.S. have reported seeing it in places such as Arizona and California, ...

North America's "broken heart" is an ancient rift valley in the Midwestern United States. The rifting began roughly 1.1 billion years ago due to tectonic forces pulling what is now the North American ...

Something very strange appears to be happening deep, deep underneath the U.S. Midwest and the Ohio Valley. North America’s geological core has persisted for more than a billion years; it’s what ...

It may not be as dramatic as a total solar eclipse, but there's something equally epic about watching Earth's shadow gradually engulfing and coloring the moon during a total lunar eclipse. The next ...

Voices and Votes is part of Museum on Main Street, a Smithsonian program that brings world-class exhibitions to small towns ...