Scientists Are Just Beginning to Understand How Old Faithful Works

(via Atlas Obscura)  Old Faithful is one of the most famous sights in Yellowstone National Park, but for all its popularity, we don’t know exactly how the predictable geyser works. Something is heating that water and forcing it out at regular intervals, but the exact mechanics have remained a mystery. Thanks to a new study, we now have a clearer picture of what things look like underground.