Passers-by look at the robot outside a "robot restaurant" in Harbin, Heilongjiang province, June 28, 2012. There are 18 robot waiters and chefs in this restaurant. All of them are designed and built by engineer Liu Hasheng and his team. Liu said he is working two kinds of robots: one could clean outside windows of skyscrapers and the other could help elder people. [Photo/Xinhua]

Liu Hasheng checks a cooking robot in the "robot restaurant" in Harbin, Heilongjiang province, June 28, 2012. [Photo/Xinhua]