Gapcasts.

Thanks to TED, I know that Hans Rosling can eat swords as well as he can enthuse about healthcare. He talks in other places too, and Hans Rosling's 2nd Gapcast is 4 minutes on urbanization. Clips from his talk feature in "A Slum Insight."

A Slum Insight was made by Gapminder, UN-Habitat and ITC in 2006 for the UN Habitat conference World Urban Forum III , Vancouver, Canada. The film was directed by Filmfront Stockholm and the graphic profile was made by Züt.