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In 1930 the overhead projector beat out the chalk board for most used classroom tool
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The film projector was made obsolete by the video tape in 1951
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In 1959 the ohotocopier makes "light" work of make copies, sending the mimio graph back to the tar pits.
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Films could now be viewed on frame at a time in sequence with this handy dandy machine.
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In 1970 the first hand held calculator was introduced. This displaced the slide rule as well as the old paper and pencil.
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All sorts of data and images becane possible to save and be easily accessed through this little wonder. Who needs books with pictures now?
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No more need to theororize what x cubed looks like or mess up a piece of graphing paper
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WOW no more need for chaulk, makers or even someone to clean up
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Goodbye desk tops, laptops, graphing calculators and keyboards!
