In this July 17, 2015, file photo, a car drives by HitchBOT, a hitchhiking robot in Marblehead, Mass. The Canadian researchers who created hitchBOT as a social experiment say someone in Philadelphia damaged the robot beyond repair on Saturday, Aug. 1, ending its brief American tour. The robot was trying to travel cross-country after successfully hitchhiking across Canada last year and parts of Europe. (AP Photo/Stephan Savoia, File)
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