Most familiar symbol of the U. S. schoolroom is the blackboard. Few educational devices have lasted so long or with so little reason. One hundred years ago blackboards were actually wooden boards painted black. Then wood was replaced by slate. But even slate blackboards, besides being ugly, are inefficient. They hurt children's eyes. They darken schoolrooms. After a spell of chalking, erasing and washing, they grow grey, have to be resurfaced every three years. Yet tradition has so strong a hold on U. S. education that blackboards remain in almost every school, even...
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