Awhile back Bill Nye debated Ken Ham on science vs. creationism, at Ham's museum of young earth creationism. Nye just posted some background on the talk and his preparations, and this kind of jumped out at me:
On the slides in my "decks," as they're called, I do not use many words. My colleagues sent me dozens of PowerPoint slides for my use. Thank you of course, but my goodness you all, when I watch many of your presentations, it's like reading a page of book projected on a wall. How can someone in the audience focus on what you're saying, when there's a blizzard of words in front of her or him?