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Prior to 1920, most schools were one-room school houses.
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In 1923, radios were introduced into schools. Radios were used for history and math lessons.
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In 1930, over head projectors were introduced into the classroom.
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In 1933, schools were using silent films and films with sound.
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From 1939-1940, schools started using TVs in the classroom.
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Headphones were used in the 1950s in language labs.
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In 1960, white boards were introduced into classrooms. Whiteboards replaced chalk boards.
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In 1963, Texas Instruments introduced the first hand held calculator.
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In 1973, scantrons were starting to be used to grade exams.
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In 1984, Apple McIntosh introduced their computer.
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In 1988, the laptop is introduced. The laptop would eventually become a teaching tool.
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In 1991, the smart board is introduced into schools.
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In 2002, majority of U.S. schools have internet.
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In 2012, iPads are being used for educational purposes in schools. Majority of students also have cell phones.