Shedding some light on the problem of dirty water

On a trip to Zambia, Timothy Whitehead says, he saw chemical tablets being widely used to sterilize drinking water. Convinced that there must be a better way, he created a bottle that sterilizes water using an ultraviolet bulb powered by a wind-up generator. The Pure bottle is competing for an international innovation prize sponsored by Sir James Dyson, but Whitehead has other goals, too. "Big water companies have been in contact," he says. "There's definitely the potential that it will go further."

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