Before Ferdinand Hayden's extensive geological exploration of the Yellowstone area in 1871, many doubted the stories of prior European explorers describing a remarkable landscape dotted with geysers and boiling springs. Paintings and photographs from Hayden's expedition helped convince Congress to make Yellowstone the US's first national park, and it now draws millions of visitors each year. Why do park officials refrain from extinguishing wildfires that pose no immediate threat to human life? Discuss (http://forum.thefreedictionary.com/postst24812_Yellowstone-National-Park-Established--1872-.aspx)
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