1900 – 1920 The one-room schoolhouse.
1923 classrooms begin incorporating radios into penmanship, accounting, history and arithmetic lessons.
1930s Overhead projectors, initially used for US military training, quickly spreads to schools.
1933 52% of schools are using silent films and 3% are using films with sound.
1939 The first TV appears in a classroom in LA.
1950 Headphones become popular in school language labs.
1960 Whiteboards are invented to replace the Chalkboard.
1964 BASIC is developed at Dartmouth College with the intent of giving students a simple programming language that is easy-to-learn.
1967 Texas Instruments develops the handheld calculator.
1972 Scantrons are used to automatically grade multiple choices tests.
1973 The Minnesoto Educational Computing Consortium is founded. The organization popularizes school software such as Oregon Trail (’74) and Lemonade Stand (’73)
1984 Apple Macintosh computer is introduced. The ratio of computers to students in US schools is 1-92.
1985 Touch typing software Mavis Beacon Teaches Typing is developed and popularized in schools.
1988 Laptops are introduced and are eventually utilized as teaching tools.
1990 CD-ROMs become a predominant form of storage.
1991 SMART boards are introduced in schools.
2002 According to the National Center for Education Statistics (NCES), about 99% of American public schools have Internet access. About 35% had Internet access in 1994.
2012 1.5 million iPads are used in US schools.
2013 90% of students under the age of 18 have access to mobile technology.