Christopher Salz, a resident of Neustadt, Germany, was surprised during his wedding reception when his groomsmen stopped the party to start up a projector. They played a video for him, a greeting from Adam Tornheim – the American man who had saved his life through a stem cell transplant five years earlier. Although Christopher and Adam had never met, he and his bride Maike watched with their hearts full of emotion – their wedding would never have been possible if not for this stranger. Then, as the video ended, Bruce Springsteen’s “Born in the U.S.A.” began to play – and…