Focus it's not just high-flown ideas or high-tech inventions that get things done in the developing world. Ingenuity and common sense are vital, too. I'm standing in a festering slum: there are no sewers, no drains, the communal pit latrines are overflowing, and the alleyways are too narrow for conventional latrine-emptying trucks. Three-quarters of a million people are trapped in this area of about 100 hectares—roughly the size of London's Regent's Park. For the inhabitants, clearing the sewage is a pressing priority.
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