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>Robert Smithson's famous work of land art -- Spiral Jetty -- was completed in 1970. A few short years later, the artwork… -
Inside every tree there’s enough information to keep researchers around the West busy for their entire careers. This week on the program, a look at…
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By taking tree ring samples from thousands of trees around the West and determining how old each tree is and how many cycles of wet and dry each has been…