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wiseGEEKpeople used slates in class and would write down the problem and then do it. Then a scotich teacher put her students boards on the wall
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nytimesit replaced the slate. now the pencil is usally used
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headset plusmost needed in drills on the computer
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eHowused by the milltairIy in worldwar II
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usmsrkerboardthe chalk board would make a mess with dust on compture keyboars .puls now no getting chalk out of erasers
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ERICby 1960 there were more than 50 channels that were educational
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USGenWebgrades your multiple choice test
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when you needed copies all you did is crank
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USGenwebwhen you need to grade multpile choice test scantron does