Are robot waiters the future? Some restaurants think so

You may have already seen them in restaurants: waist-high machines that can greet guests, lead them to their tables, deliver food and drinks and ferry dirty dishes to the kitchen. Some have cat-like faces and even purr when you scratch their heads. But are robot waiters the future? It's a question the restaurant industry is increasingly trying to answer. Many think robot waiters are the solution to the industry's labor shortages.