The chalkboard enters the poetry of day students ages attached to it is the same ambitious dreams of school age. But besides the positive side of the chalkboard next to it is the harmful effects affecting the health of teaching is very large, we still remember the song "Charcoal" with the lyrics "I love this rope minutes, teacher hair has more silver. Silver added as pollen "have appeared on the most harmful effects of pollen when writing table directly affect teachers. today in some remote places, the schools still use the blackboard to teach the students it will affect not good for both teachers and students, however in recent years, when science and technology day grow along with economic development has started more school facilities from replacing the chalkboard with whiteboard markers to write premium features Vietnam, above all, to protect the health of people use.
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