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The 20-Minute Rule for Great Public Speaking — On Attention Spans and Keeping Focus | by Alf Rehn | The Art of Keynoting | Medium
https://medium.com/the-art-of-keynoting/the-20-minute-rule-for-great-public-speaking-on-attention-spans-and-keeping-focus-7370cf06b636
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There’s an old quote, one attributed to the American businessman Phil Crosby, that goes:
