Learn how geologists at Yellowstone National Park clean up hot springs filled with litter, saving them from irrevocable ...

The beating heart of Yellowstone National Park is without a doubt the Grand Prismatic–the largest hot spring in the US. Its colorful bands are the product of hardy bacteria and algae that live in the ...

Just because they’re bacteria doesn’t mean they can’t be beautiful. A half-mile boardwalk accesses the east side of Grand Prismatic Spring as well as Excelsior Geyser, which was once the largest ...