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In the 2013 Richard Dimbleby Lecture, one of the world's greatest entrepreneurs and leading philanthropists, Bill Gates, explains his optimism for a world free of the debilitating disease, polio. He explains why he is devoting so much of his time, money and influence to eradicating polio, and how we can all help to finish the job.

Since the launch of the Bill and Melinda Gates Foundation, Bill Gates has become a leading figure on the international development stage, seeking innovative solutions to extreme poverty and poor health in developing countries.