A 17-year-old boy slipped and plummeted to his death from the popular new 6th Street Viaduct in Los Angeles, after climbing the bridge as part of an apparent social media stunt, according to police. The youth’s body was found at about 2 a.m. Saturday on the eastern side of the span, which has become a troubling magnet for gunplay, dangerous stunts and careless online clout-chasing since it opened about a year ago. The teen, whose name has not been released, was taken to LA County USC Medical Center, where he was pronounced dead. Los Angeles Police Chief Michel Moore said...