I’ve linked to Hans Rosling before, but his 2007 TED talk makes him worth a second mention:

A good speaker, with some very interesting facts to present and ways to present them, and make sure you stay for the surprise ending! (A warning, it’s 19 minutes long.)

Found via Presentation Zen, who also links to several other of Rosling’s presentations; see also his web site, in particular the GapCasts.

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