We need humor like we need the air we breathe, says editorial cartoonist Patrick Chappatte. In a talk illustrated with highlights from a career spent skewering everything from dictators and ideologues to selfies and social media mobs, Chappatte makes a resounding, often hilarious case for the necessity of satire. «Political cartoons were born with democracy, and they are challenged when freedom is,» he says.

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A free world needs satire | Patrick Chappatte