Luby learned that Procter & Gamble, the consumer product conglomerate, was eager to prove the value of its new antibacterial Safeguard soap. So despite his colleagues’ skepticism, he persuaded the company to provide a grant for a proper study and to supply cases of Safeguard both with and without triclocarban, an antibacterial agent. Once a week, field-workers from HOPE fanned out through twenty-five randomly chosen neighborhoods in the Karachi slums distributing the soap, some with the antibacterial agent and some without. They encouraged people to use it in six situations: to wash their
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