Yellowstone's Grand Geyser is the tallest predictable geyser in the world at a height of over 180 feet. Grand has a period of about 8-10 hours, with a prediction has an accuracy of +/- 90 minutes. Unless you get very lucky, it takes some patience to see this. I ended up waiting almost 3 hours to see the show.
The physics of geysers are fascinating in how water, pressure, and heat interact with fissures in the earth to produce super-heated water, which eventually shoots to the surface.
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