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Millions of infants and women of childbearing age all across Afghanistan are being immunized against measles and tetanus as part of an ambitious UNICEF-supported plan to reduce deaths from these preventable diseases.
Alleviating poverty is more guesswork than science, and lack of data on aid's impact raises questions about how to provide it. But Clark Medal-winner Esther Duflo says it's possible to know which development efforts help and which hurt—by testing solutions with randomized trials.