Using the internet while working makes an employing much more productive than a employing that is not doing anything at all. Study shows that using the internet during their leisure time improves an individuals concentration.
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I've noticed this actually happens to me. When i have a free/study period and just have those days where i just want to relax and surf the internet for a few minutes, next period i would become very studious (as pointed out by alex in math class ^^)
