This document discusses the history and future of extended reality (XR) technologies. It begins with an overview of previous industrial revolutions and the emerging "fourth wave" of XR, augmented reality (AR), and artificial intelligence. The rest of the document summarizes the most important XR topics and events of 2019, predicts focus areas and technologies that may see growth from 2020 to 2025, and concludes by stating that many people will get rich from these emerging technologies as enterprise adoption increases, smartphones continue powering AR, and the industry iterates quickly on AR head-mounted displays.