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The Genius of Roald Dahl: With his magical storytelling and memorable characters, Roald Dahl became one of the world's most successful children's authors, penning classics such as Willy Wonka and the Chocolate Factoryand Matilda. British comedian David Walliams immerses himself in Dahl's books to understand the great author's special touch, tracing some of the influences on his work from his dramatic, and tragic, life.