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Bill & Melinda Gates: Our bet for 2030

Updated 2:06 PM ET, Sat January 24, 2015

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Bill and Melinda Gates in Mapinga, Tanzania, in 2011.
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Bill and Melinda Gates in Mapinga, Tanzania, in 2011.
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Bill Gates during a site visit to the ACOS Ethiopia processing facility in 2012.
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Bill Gates during a site visit to the ACOS Ethiopia processing facility in 2012.
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A young boy samples an orange-fleshed sweet potato in a busy market in Mwasonge, Tanzania.
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A young boy samples an orange-fleshed sweet potato in a busy market in Mwasonge, Tanzania.
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House-to-house polio vaccination team members Heena Khatun and Rukhsar Khatun work in the Kamla Nehru Nagar slum in Patna, India, in December 2010.
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House-to-house polio vaccination team members Heena Khatun and Rukhsar Khatun work in the Kamla Nehru Nagar slum in Patna, India, in December 2010.
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An ASHA worker visits the Chandan slum to discuss general health concerns and family planning practices with residents in Uttar Pradesh, India, on June 4, 2014.
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An ASHA worker visits the Chandan slum to discuss general health concerns and family planning practices with residents in Uttar Pradesh, India, on June 4, 2014.
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Melinda Gates meets with a local women's group to discuss sanitation issues in New Delhi in September 2014.
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Melinda Gates meets with a local women's group to discuss sanitation issues in New Delhi in September 2014.
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