@calestous Grand Challenges 10 years old. What are you doing 2 celebrate?
http://www.sciencemag.org/content/302/5644/398.full …
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@calestous Will celebrate 10 years of Grand Challenges in Rio at end of month & look forward 2 next decade of#InnovationThanks. Twitter will use this to make your timeline better. UndoUndo
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