A robot serves beer in a restaurant in Shenyang, capital of northeast China's Liaoning Province, May 20, 2015. Powered by battery to work up to 7 hours, the 140-centimeter-high robot weights 70 kilograms and moves at a speed of 0.8 meter per second. Integrated with sensors, navigation hardware and user interface technology, it is able to hold and serve up to 8 kilograms of food or beverage at one time. (Xinhua/Yao Jianfeng)