In this Monday Oct. 22, 2012 photo, Google operation manager Steve Silverman is silhouetted against a canyon wall as he poses with the Trekker during a demonstration for the media along the Bright Angel Trail at the South Rim of the Grand Canyon National Park in Arizona. The search engine giant is using the nearly 40-pound, backpack-sized camera unit to showcase the Grand Canyon’s most popular hiking trails on the South Rim and other off-road sites. It’s about 4 feet in height when set on the ground, and when worn, the camera system extends 2 feet above the operator’s shoulders. (AP Photo/Rick Bowmer)
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