आँखो की पलकें क्यों झपकती हैं??(Why do we blink our eyes??) what the reason .......

why do we blink our eyelids???? ह हमारी आँखो की पलके बार - बार क्यों झपकती हैं?...
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About video:- in this video we tell about the reason of blinking our eyelids.....
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Видео आँखो की पलकें क्यों झपकती हैं??(Why do we blink our eyes??) what the reason ....... канала Sachin Pal