لماذا يتغير لون الشعر إلى الرمادي؟

لماذا يتغير لون الشعر إلى الرمادي مع التقدم بالسن. انقر هنا لمشاهدة المزيد من الفيديوهات: https://alugha.com/LifeNoggin إن Life Noggin سلسلة رسوم متحركة أسبوعية تعليمية. نحن نستكشف جميع المواضيع الممتعة مثل العلوم, التاريخ, الفن و الثقافة الشعبية. قم بمتابعتنا! https://twitter.com/LifeNoggin https://facebook.com/LifeNoggin https://www.LifeNoggin فريق Life Noggin: الرسوم المتحركة والتصميم: http://www.jmccartney3d.com/ الصوت: http://youtube.com/patdoesit الإنتاج: http://www.IanDokie.com التأليف: https://www.youtube.com/user/AwkwardAdolescents المصادر: http://www.loc.gov/rr/scitech/mysteries/grayhair.html https://www.livescience.com/14643-scientists-uncover-secrets-hair-turns-gray.html

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