Helping African Farmers with GPS and YouTube

Across Africa, most people live in rural areas. But most of the continent’s money -- 60 percent of all GDP -- comes from capital cities. Calestous Juma thinks agricultural innovation is key to African development. He’s professor of the Practice of International Development and directs the Science, Technology, and Globalization Project at Harvard University’s Kennedy School of Government. He’s the lead author of an optimistic new book, The New Harvest, Agricultural Innovation in Africa, which sees a big role for technology.