BOSTON (AP) — With its thumb raised skyward and a grin on its digital face, the robotic creation of two researchers in Canada is about to start a hitchhiking journey across the U.S. The humanoid robot named hitchBOT has already caught rides across Canada and in Europe, relying on the kindness and curiosity of strangers. But on Friday it starts its first U.S. tour, setting out from Salem, Massachusetts, with dreams of San Francisco ahead. Along the way, it hopes to see some quintessential American sites, including Times Square, Mount Rushmore and the Grand Canyon. The kid-size robot is immobile...