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Hi-tech helps world's 'invisible' -

Handheld computers could help give a voice to the huge numbers of people that do not officially exist.

The gadgets are being used to gather data about the estimated one billion people who live in shanty towns.

The Mobile Metrix project aims to determine how big these communities are and discover what their lives are like.

The up-to-date data will be given to governments and aid workers to help fine tune projects trying to help these communities.

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