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Public domain Windows Desktop wallpaper from US National Parks

Agate Fossil Beds National Monument - Nebraska

During the 1890s, scientists rediscovered what the Lakota Sioux already knew - bones preserved in one of the most complete Miocene mammal sites in the world.

Photo credit to National Park Service


Mark W. Kaelin has been writing and editing stories about the IT industry, gadgets, finance, accounting, and tech-life for more than 25 years. Most recently, he has been a regular contributor to,, and TechRepublic.