The McDonald's McRib is back, hitting restaurants nationwide today. The legendary boneless pork sandwich, famously molded to resemble a rack of ribs, is both a feat of modern engineering and shrewd marketing. It garners almost as much attention for its pseudo-meat shape as its impermanence on restaurant menus. The barbecue-sauce-smothered sandwich was supposed to return at the end of October, but was pushed back to help boost end-of-the-year sales. Better late than never.