Rooftop solar kit doubles as water reservoir

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In developing nations near the equator, the weather comes in extremes — the sun is at its strongest, while rainfall levels are also the highest in the world. At the same time, the same areas are blighted by a lack of electricity and clean drinking water. In order to tackle both of these issues, designers in Mexico have developed the PhotoFlow, a device that harnesses energy from the sun in good weather and collects and filters rainwater in bad weather.

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