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Making Data Simple

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How to Write a Great Speech

CNN's John Defterios talks to David Walliams about writing speeches. He says the best pitches from entrepreneurs follow this 10, 20, 30 rule. That means no more than 10 slides, no more than 20 minutes long and a 30 point font. "You've really got to tighten it up," he says of his speechwriting process.

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