Modern horses are part of the family Equidae. The fossil history of Equidae is well documented, but new evidence about its evolutionary history — and new interpretations of it — continue to accumulate. 

A tsunami hasn't affected the Pacific Northwest coast since 1964, yet bright-blue metal signs warning of them dot coastal streets. Find out why scientists are certain these communities are at risk.

Why did Hawaiian officials evacuate Hilo Bay in 1986 after a 7.7 earthquake but call off an evacuation in 2003 after a 7.8 one? The answer is DART. Learn more.

In 1991, the larvae of a striped, thumbnail-sized European shellfish floated quietly into the Hudson River. Find out how the zebra mussel invasion has been both tenacious and transformative. 

Unlike most zoo-raised or domestic species, Asian elephants have never been selectively bred, so they remain genetically wild. See how this helps with forest reintroduction efforts. 

More than three million visitors step onto this charged volcanic landscape every year. Yet the geologists that monitor it are unconcerned about a large, imminent eruption. Find out why.

Unlike people in Africa, who kept their distance from elephants except to hunt them, people in Asia have lived closely with elephants since at least 2000 B.C. Take a closer look at the underlying bond that exists today. 

The magma chamber responsible for Yellowstone's volcanic activity is buried 8km beneath the surface. Find out how researchers monitor its geologic moves.

The Asian elephant once roamed from the Tigris and Euphrates rivers in western Asia as far east as China's Yangtze River. Take a closer look at this now highly endangered species. 

Meet Professor Robert B. Smith, who has spent nearly his entire 40-year scientific career studying the volcanic setting of Yellowstone National Park and geologic evolution of the Teton Range.