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Dutch engineer designs homemade purifier
Updated: 2014-01-21 17:12
By Liu Zheng (chinadaily.com.cn)
Comments
Niels Jacob Woelders and his 3 year-old son Ouya test for air pollution caused by a vacuum cleaner on Jan 15, 2014 in Shanghai. [Gao Erqiang / Asianewsphoto]
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