Talk about passing gas: Vast stores of helium are escaping from the steam vents and hot springs of Yellowstone National Park after being trapped within Earth’s crust for up to 2 billion years, according to new research.

In a study published Wednesday in the journal Nature, researchers with the U.S. Geological Survey determined that the famed national park was releasing hundreds — if not thousands — of times more helium than anticipated.

via It’s up, up and away for ancient trapped helium at Yellowstone – Los Angeles Times.