In the late 1990s the pair cofounded Shree Renuka Sugars in Belgaum, a trading hub near the border of Karnataka and Maharashtra, the country's top sugarcane-producing states.

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Thus, India's Shree Cement, which has long suffered from water shortages, developed the world's most water-efficient method for making cement, in part by using air-cooling rather than water-cooling.

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One of the winners, Shree Bose, did her first experiment in second grade by trying to turn spinach blue. (Laughter.) In fourth grade, she built a remote-controlled garbage can.

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By comparison, the Duke device represents the "first cut" at making gigapixel cameras for general use, said Shree Nayar, a computer-vision researcher at Columbia University in New York, who has seen the camera at work but wasn't involved in the project.

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