Almost a billion go to bed hungry every night yet some economists are questioning how hungry the world really is. Richard King examines these controversial viewpoints and draws his own conclusions.
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In a growing number of countries across Africa and Asia, mobile phone networks are providing millions of people with inexpensive cash transfer services.
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The results may sometimes be technological, but innovation is a social process, says Nicholas Colloff, in the second of a series of posts on innovation.
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