You might recognize his mantra: a flea can bite the bottom of the pope in Rome. For Sean, it's a metaphor for never taking no for an answer. Three years after returning from the Congo, he's given the finger to skeptics by inventing a business model to end a war. Sounds radical, but it's working. Today, his nonprofit, Falling Whistles, is educating the masses, mobilizing peace forces in the Congo and shifting paradigms-all by selling whistles.

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