A 54-year-old repairman named Wen Jiaquan works to make a rotorcraft to realize his dream, shared by his wife, of flying to the sky, in Southwest China's Chongqing on July 28, 2013.[Photo/CFP]

Zhang Wuyi, a 37-year-old former boilermaker, waves to onlookers before taking his self-made submarine under water in Wuhan, Hubei province, on Tuesday.