Big bold font!

Most scientific presentations failed, among many other things, because the font presenters use is too small. F. that! Ditch the small font size! In most cases the smallest font size should be 48pt. You are not writing on digital paper. You are writing on a canvas. 
Oh, but I have so much to say!
Good for you! Now go and break what you have to say into smaller pieces!

Large font sizes has one immediate effect. You have to write less per slide. And with practice you might achieve using text as a graphic element some month ago I dissect an example of a deck using text as a graphic element.

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