Supplementary material: evolution of a product from vision to ubiquity, using WiFi as an example

I supplement my Internet literacy class with weekly discussion items, usually based on some current event. In class we talk about the evolution of a product from vision to engineering prototype to limited-market product to ubiquitous product. This year is the 25th anniversary of WiFi, so I used it as an example. The PowerPoint presentation for the discussion has four annotated slides: