China doesn’t always copy useful and popular world’s inventions. Local people also invent stuff themselves. Take a look. A local farmer Li Yuming works on his unfinished miniature submarine Xiaguang V, which is 3-metre long, 1.2-metre in height, has a maximum diving depth of 20 metres, and can hold two adults and one child at the same time. A child rides a specially constructed ice-chair on the frozen Houhai Lake in Beijing. Farmer Wu Yulu, 48, rides in a cart pulled by his walking robot. Hobby inventor Wu, who started to build robots in 1986, has invented 47 robots with different functions like jump, paint, drink, pull cart, massage, and help cooking. Chinese farmer Yang Youde pushes his homemade cannon. Yang's cannon, which is made out of a wheelbarrow, pipes and firing rockets, is used to defend his fields against property developers who wants his land. Gao Hanjie installs the rotor blades on his homemade helicopter, which is 6-meter
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