Almost every day we read about some cool new technology that promises to change the world. Many of these products will indeed do that – but their impact will be greatest for those of us already living comfortable lives in industrialized nations. Meanwhile, most people in developing countries are left to contend with deadly diseases, smoggy air, dirty water, poor nutrition, widespread illiteracy, outdated tools, and unreliable electricity. Who creates gadgets to change their world?

The 10...


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