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Entertainer Bill Cosby gestures during an interview about the upcoming exhibit, Conversations: African and African-American Artworks in Dialogue, with the Smithsonian’s National Museum of African Art (Credit: AP/Evan Vucci)

Entertainer Bill Cosby gestures during an interview about the upcoming exhibit, Conversations: African and African-American Artworks in Dialogue, with the Smithsonian's National Museum of African Art (Credit: AP/Evan Vucci)