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Melinda Gates, co-chair of the Bill and Melinda Gates Foundation, speaks at the Advancing Asia Conference in New Delhi, India, on Saturday, March 12, 2016. The conference runs through to March 13. Photographer: Kuni Takahashi/Bloomberg via Getty Images

Melinda Gates, co-chair of the Bill and Melinda Gates Foundation, speaks at the Advancing Asia Conference in New Delhi, India, on Saturday, March 12, 2016. The conference runs through to March 13. Photographer: Kuni Takahashi/Bloomberg via Getty Images