How Not to Be Ignorant About the World is a compelling TED Talk by Hans and Ola Rosling that addresses widespread misconceptions about global development and emphasizes the importance of a fact-based worldview.

How much do you know about the world? With his famous charts of global population, health, and income data (and an extra-extra-long pointer), Hans Rosling demonstrates that you have a high statistical chance of being quite wrong about what you think you know. Play along with his audience quiz — then, from Hans’ son Ola, learn four ways to get less ignorant quickly.

TEDTalks is a daily video podcast of the best talks and performances from the TED Conference, where the world’s leading thinkers and doers give the talk of their lives in 18 minutes (or less). Look for talks on Technology, Entertainment, and Design, science, business, global issues, the arts, and much more.