This document provides a brief history of augmented reality from the 1950s to present day. It discusses key concepts like virtual reality, augmented virtuality, and how augmented reality overlays virtual imagery onto the real world. Examples of early AR applications are mentioned from the 1990s and 2000s. Current AR technologies are enabled by advances in mobile processors, displays, and tracking sensors like cameras, GPS, and accelerometers. The document suggests potential applications of AR in education and concludes by asking what's next for the field.