Jehan Ratnatunga, a 26-yearold Australian, thinks the best strategy for underwriting water sanitation projects in the developing world is to launch a nonprofit toilet paper company called Who Gives a Crap. Silly? Perhaps. But the idea proved just intriguing enough to earn Ratnatunga a spot as one of 25 fellows in the first-ever Unreasonable Institute taking place this summer in Boulder, Colo. Some 284 applicants from 46 countries vied for the chance to take part in this new social enterprise inc…

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