Watch @HansRosling explain population growth & economic stratification in @TEDtalks http://io9.com/5912155/watch-hans-rosling-use-rocks-to-deliver-the-shortest-ted-talk-ever … via @Sida @jbeijmo
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Watch @HansRosling explain population growth & economic stratification in @TEDtalks http://io9.com/5912155/watch-hans-rosling-use-rocks-to-deliver-the-shortest-ted-talk-ever … via @Sida @jbeijmo