VIRGINIA CITY, Nev., May 21, 2012 /PRNewswire/ -- Comstock Mining Inc.

GARRYOWEN, Mont., Jan.

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U.S. Department of Agriculture (USDA) scientists have found that unmanned aerial vehicles (UAVs), a tool used by the military, may be suitable for keeping an eye on changing land-use patterns across vast tracts of western rangeland.

The fossilized teeth of a beaver found by Bureau of Land Management employees on federal land represents the earliest record of the animal in North America and are estimated to be 7 to 7.3 million years old.