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Apps for Clean Water

Around the globe, more people have access to smartphones than to clean water and sanitary facilities. But a competition for smartphone developers, sponsored by the World Bank, hopes to change that. Numerous apps show how the internet can be used to help to improve water quality.

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To allow more people access to clean water, the World Bank launched its "Sanitation Hackathon" competition. More than a thousand programmers take part each year. Now a digital world map that functions as an open source data bank is to document the quality of water sources.