Lest the title throw you off, this isn’t a design book. It’s a book about how human beings capture and process information. The 100 things span diverse aspects of this from central/peripheral vision, daydreaming, creativity, response interpretation, motivation, visual fatigue and laughter.
Each lesson is more like a tip, illustrated with a case or story and bulletted at the end with salient points. I found it interesting and easy to read, even though I have little to do with design. The author appears to have taken her own advice well and the information was presented in a coherent, easily navigable and pleasing manner.