They were willing to revise their beliefs about what worked in light of the evidence they received and then go out and do what the evidence suggested they should. In contrast with the PlayPump, the most effective programme turned out to be remarkably boring: Grace Hollister, now the director of Deworm the World Initiative, told me that, ‘deworming is probably the least sexy development programme there is’. But by focusing on what was effective rather than what was emotionally appealing, they produced outstanding results, significantly improving the lives of millions. Kremer and Glennerster
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