Created by a 7.3-magnitude earthquake in 1959, Yellowstone's Red Spouter is a thermal with many personalities. Depending on the season, it can be a hot spring, a boiling mudpot or it can just spew hot gas. Many of Yellowstone National Park’s thermal features are defined by their personalities. The regularity of Old Faithful, the colossal noise and steam clouds of Steamboat Geyser or the colorful palette of the Artists’ Paintpots. By that logic, the Red Spouter might be Yellowstone's most ambitious. Instead of building a reputation around a single personality, it tries to — and succeeds at — being many...