Tian Shengying (R), a 55-year-old blacksmith, adjusts the rotor of the helicopter, in Shenyang, Liaoning province, September 21, 2012. Tian built the bottom, body, tail and rotor of the helicopter single-handedly without a detailed blueprint in just half a month after receiving a request by an unmanned aircraft research centre. (Photo by Sheng Li/Reuters)
