Dai Yuanwu displays his design sketch on May 5, 2015. The 25-year-old man spent three months to design and three days to make an excavator in Neijiang, Sichuan province. According to him, he has made two different machines before. Not only did it work perfectly, Dai also optimized it to meet his needs. He spent less than 40,000 yuan ($6,448) making it when a commercially available model costs 100,000 yuan or even 200,000 yuan. (Photo/CFP)
