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Hans Rosling (born 27 July 1948) is a Swedish medical doctor, academic, statistician, and public speaker. He is the Professor of International Health at Karolinska Institutet and co-founder and chairman of the Gapminder Foundation, which developed the Trendalyzer software system. He rose to international celebrity status after producing a Ted Talk in which he promoted the use of data to explore development issues.

Hans and Olaf Rosling's speach about how to reduce your ignorance of the world.