Robot "NAO" plays the traditional Chinese Tachi fist during the 7th China Hangzhou Electronics & Information Fair in Hangzhou, capital of east China's Zhejiang Province, April 18, 2013. The fair, which kicked off on April 18, will last until April 21. (Xinhua/Wu Huang)

Robot "NAO" plays the traditional Chinese Tachi fist during the 7th China Hangzhou Electronics & Information Fair in Hangzhou, capital of east China's Zhejiang Province, April 18, 2013. The fair, which kicked off on April 18, will last until April 21. (Xinhua/Wu Huang)