Tech billionaire and philanthropist Bill Gates plans to devote the next 20 years to the eradication of preventable human diseases. He tells "60 Minutes'" Charlie Rose that he wants to help "the bottom two billion" of the world who live in poverty:
Charlie Rose: Starting with polio?
Bill Gates: Get it done by 2018.
Charlie Rose: Tuberculosis?
Bill Gates: Take probably six or seven years.
Charlie Rose: Malaria?
Bill Gates: Malaria's the one that the tools are being invented now. Fifteen and perhaps even 20 years. But start to really shrink that map.
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