Part 3
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The search for climate change solutions requires passion, resources and a sense of urgency — three qualities Bill Gates clearly possesses.
Part 2
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The connections that shaped Bill's life come into focus, including a childhood friendship and his unique bond with Microsoft co-founder Paul Allen.
Part 1
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Bill Gates speaks about his life-or-death mission to get better sanitation to the developing world. Also, his sisters share their childhood memories.