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"4. Give a strong, conceptually oriented introduction. Be as brief as possible while still making all of your points. Be sharp at the beginning. Remember the 20 Minute Rule: You should show a data slide no more than 20 minutes into your talk (or your audience has the right to get up and walk out!)."
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Everything you might want to read about this year's Nobel Prize in Physics, and then some. For free from AIP.