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Flame comes out of the stoves. wasuú really thes. we had clean combustion driven by it ownctrical generation. >> reporter: the generated energy can charge electronics through a usb port. but it also powers a fan that e efficient and creating less an flame alsoe busine when they learned about thearly half the worlds cook on smoky open leads to nearly 2 millionñq deaths annually. >> reporter: the inventors went back to work and created a home stove. >> c2noming to understa that ther broader glob...