The Supervolcano Under Yellowstone Is Alive and Kicking
Around 10,000 geothermal features in Yellowstone hint at a mysterious hot spot beneath the crust.
Why We’re Drawn Into Darkness
Author Robert MacFarlane on the awe and horror of subterranean places.
The Dam Problem in the West
On a raft trip down the Green River, a writer faces her environmental preconceptions.