Just 50 miles off the Pacific Northwest coast is an earthquake hot spot that threatens to unleash on Seattle, Portland and Vancouver the kind of damage that has shattered Chile.

The fossilized remains of a 67 million-year-old snake found coiled around a dinosaur egg offer rare insight into the ancient reptile's dining habits and evolution, scientists said Tuesday.

A new study shows that male frogs exposed to the herbicide atrazine – commonly found in U.S. rivers and streams – can make a startling developmental U-turn, turning female so completely that they can mate with other males and lay viable eggs.