In my town we have monthly science meeting called the Cafe Scientifique. A speaker must present his topic in twenty minutes without a projector (sort of an expa

In my town we have monthly science meeting called the Cafe Scientifique. A speaker must present his topic in twenty minutes without a projector (sort of an expanded elevator pitch). It can work even for the most complicated topics. The speaker is forced into a more story-telling style. And to focus on a few points told well. P.S. The speaker may distribute a single handout or have a couple images as a large poster.