Free solar charging for cell phones in Belgrade

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For all the free cell-phone charging efforts we've seen over the years, it's remarkable how difficult it can still be to find an energy supply when one needs it most. Not long ago we wrote about Vodafone's solution, which took the form of charger-equipped taxis in London, and just recently we came across "The Strawberry Tree" — an even larger effort in Serbia that offers free, solar-powered charging to anyone passing through Belgrade's Obrenovac district. The Strawberry Tree is the brainchild of a group of students from the University of Belgrade, and it may well represent the world's first entirely…

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