Bill Gates Q&A: 'Capitalism did not eradicate smallpox'

    On Tuesday, Bill Gates released his annual letter commenting on his foundation's work. This year's edition takes aim at the "three myths" that block progress for the poor - the myth that aid doesn't work, the myth that aid is wasted and the myth that aid will just lead to overpopulation. We spoke about the three myths Tuesday morning. An edited transcript follows:

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