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A Kenyan start-up has won the $1 million Hult Prize for its business idea: biodegradable sanitary pads made out of banana fiber. The prize is given annually to young people around the world to solve the planet's most pressing problems through social entrepreneurship. Lennox Omondi, one of the four student founders of Eco Bana, told Audrey Brown what inspired their idea. (Photo Credit: Hult Prize)