In this July 12, 2017, photo, Ben Brack, a firefighter and public information officer, tests the stability of a beetle-killed tree at the site of a wildfire locally called the Keystone fire, near Albany, Wyo. The fire was burning in a dense forest of beetle-killed trees, which pose a safety hazard for firefighters because the trees, weakened by the bugs, topple more easily than living trees. (AP Photo/Dan Elliott)
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