The Steamboat Geyser at Yellowstone National Park can spout 300 feet of scalding water into the air, a feature of the world's tallest active geyser. That is known. What isn't known is why is the geyser has erupted three times in the past six weeks, including one event on Friday in an unusual pattern that hasn't occurred since 2003. The spike in activity has puzzled scientists who closely monitor Yellowstone - the crown jewel of the national park system [...]