-Helpful:+ Is the way for people to communicate with each other+ can send any message to everyone+ Can save all the important contact+ The notes of the meeting or the working schedule+ Surfing the Web and watching movies to entertain+ Help for students learning easier+ More more information, news, ...+ Read the newspapers or watch your favorite films, ...+ ...-Harmful:+ They cause damage to the eyes+ They cause harm to the skin surface+ reduced memory+ Can cause cancer+ Negative emotions influence+ Increase the level of stress
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