Eminem's new album not only puts his infamous pill addiction behind him, it might just make him hip-hop's alpha dog all over again. So why isn't this man smiling? [Cover story excerpt] As tourist attractions go, 19946 Dresden Street doesn't look like much. A squat, brick-faced house on the east side of Detroit, its front yard is a rectangle of dry soil, flecked with trash and tufts of grass. At just past 11 on a sunny Tuesday morning, a woman in her late 20s named Sierra is standing on the front porch, scanning the street, holding her infant daughter on her hip. "People come by here all the time," Sierra says. Her voice is low and friendly, and she wears a small stud in her nose.