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