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The scientist questions and answers. Our science editor, Tim Steer, is now online and answering some of our readers questions about robotics - the study and design of robots. Have we invented intelligent robots? Sarah Noble, Bristol No, we haven't. But scientists are working on it. They have created robots that interact with people. They have programmed the robots to watch people and to react to them. Which scientists have worked in this field? Jeremy Mitchell, Exeter People like Cynthia Breazeal and David Hanson. David has designed a robot head called K - Bot. The robot has cameras in her eyes and she can make twenty - eight expressions with her face. Can you buy domestic robots? Gordon Pitcher, Manchester Yes, you can. Sanyo has developed a guard robot called Banryu. It can guard your house and send messages to your mobile phone. It hasn't appeared in the shops but it will appear next year. But the cost will be $16,400! An American company has produced the Roomba floor cleaner. It costs only $199 and can vacuum floors for you. Have you ever used one of these domestic robots? Colin Allan, Cardiff Well, I haven't tried the Banryu and i've never talked to K- Bot! But I have used the Roomba in my house. It's not bad - it cleans floors well but it is a bit slow. I am interested in the work of Dr Cynthia Breazeal. What robots has she designed? Cathy Rue, Norwich She has worked on several robots and she has produced an interactive robot called Kizmet. dr Breazeal has developed computer programmes that help robots interact with people. She is now working on a new robot called Leonardo.