Yellowstone Belches Ancient Helium

Yellowstone National Park’s geysers, hot springs, fumaroles and other hydrothermal features spew out a collection of gases from deep within the Earth—steam, carbon dioxide, methane, neon, argon and helium. There’s not enough of that last one, helium, for the park to start selling balloons or for visitors to sound like chipmunks, but there’s plenty for scientists to study.