800 years ago, Old Faithful went quiet. Soon, it might happen again.

Old Faithful, the famed geyser in Yellowstone National Park, erupts with such captivating regularity, they named the whole gushing spring after it.

Phenomenal bursts of hot water and steam – fed by the geothermal activity of the Yellowstone supervolcano underneath – spurt up with such punctuality they can even be predicted, giving the geyser the nickname of Eternity’s Timepiece. But Old Faithful wasn’t always so faithful, and in times long ago, Eternity’s Timepiece stopped ticking entirely.

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