Bipedal humanoid robot "Atlas", primarily developed by the American robotics company Boston Dynamics, practises tai chi during a news conference at the University of Hong Kong October 17, 2013. The 6-foot (1.83 m) tall, 330-pound (149.7 kg) robot is made of graded aluminium and titanium and costs HK$ 15 million ($1.93 million). It is capable of a variety of natural movements, including dynamic walking, calisthenics and user programmed behaviours, according to the University of Hong Kong's press release. REUTERS/Tyrone Siu (CHINA - Tags: SCIENCE TECHNOLOGY)