This document discusses the history and evolution of educational technology from the 18th century to the present. It outlines some of the key developments in instructional tools and media over time, including the adoption of slate boards and chalkboards in the late 19th century, the introduction of radio and educational television in the 1920s-1950s, the emergence of language labs and overhead projectors in the 1950s-1930s, the rise of personal computers in schools in the 1980s-1990s, increasing internet access and use of laptops in the 1990s-2000s, and interactive whiteboards and other technologies used in classrooms today. The timeline shows how technology has increasingly been integrated into classroom instruction over the last 200+ years.