Good post..In our scintific world, It is too hard to find out a man who is not using phn is very difficult. So, every body should know about the bad effect of using phn..Now a days most of the student has great ambition & bad attraction in mobile phn. That's why human body sufferes in many diseases. Boys & girls become anxious on phone...So, everybody should learn about it & abide by the all rules to avoid this bad effect.