#Energy Like many a start-up idea, Thomas Talhelm's came from personal experience. The American Ph.D. candidate at the University of Virginia was living in Beijing last year when air pollution in the city hit record highs. He was stunned at the cost of buying an air filter for his bedroom, which he figured would total $2,000 a year.http://ift.tt/1rWauPe http://bit.ly/15KdByZ
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