Yellowstone would blast millions of tons of sulfur ... the global economy billions. A Yellowstone supervolcano eruption would create no-fly zones across most of North America for months ...

A surprise eruption in Yellowstone National Park shot steam, water and dark-colored rock and dirt high into the sky Tuesday and sent sightseers running for safety.

Ever been mesmerized by the swirling colors of Grand Prismatic Spring and wondered what fuels that otherworldly boil? It ...