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  Entirely new wave of learning for any student who was in listening range.
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  produced a combined system of teaching and testing, providing reinforcement for correct answers so that the student can move on to the next lesson
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  This was put to use to help students with learning by putting images on the screen
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  This helped students by giving them visual instruction through video
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  This allowed mass production of materials for classroom learning and businesses.
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  This allowed people to create quick mathematical calculations
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  allowed educators to grade tests more quickly and efficiently
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  This allowed access to a portable computer for the first time in the market place
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  "can function as a cellular phone, fax sender, Web browser and personal organizer. PDAs may also be referred to as a palmtop, hand-held computer or pocket computer" https://www.webopedia.com/TERM/P/PDA.html
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  "AR Glasses (or even contact lenses) will layer data on top of what we naturally see, to allow for a real-world learning experience" https://www.youtube.com/watch?v=0i4v0Texqco
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