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Slate boards were in use in India in the 12th century
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The printing press was invented in Europe in th 15th century.
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Blackboards became used in schools around the turn of the 18th century.
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Improvements in transport infrastructure led to the development of the first formal correspondence education.
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BBC (The British Broadcasting Corporation) began broadcasting educational radio programs for school in the 1920s.
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At the end of World War Two the U.S. Army started using overhead projectors for training, and their use became common for lecturing, until being largely replaced by electronic projectors.
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Television was first used in education in 1960 for general adult education.
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After overhead projectors, electronic projectors were used in education around 1990
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In the 1990s the cost of creating and distributing video dropped dramtically due to digital compression and high-speed Internet access. The technology allows students to view lectures at any time.
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Youtube started in 2005 and it is increasingly being used for short clips that can be downloaded and integrated into online courses
