Art's 'Sense Of Humor' Chronicled At The National Gallery Of Art

The new exhibition "Sense of Humor" at the National Gallery of Art in Washington, D.C., showcases comedic prints and drawings, from the 15th century to today. RENEE MONTAGNE, HOST: Here is a challenge for you. Name one great painting that makes you laugh. If none comes to mind now or ever, that's probably because...

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