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يستعرض رون جاتمان العديد من الدراسات التي تخص الابتسامة .. فهو يخبرنا ان الابتسام يزيد من عمر الفرد وسعادته و انه يعبر عن مدى نجاح الفرد
Ron Gutman is the founder and CEO of HealthTap, a personalized health-info site that's currently in beta. He's also the organizer of TEDxSiliconValley. Full bio »
Translated into Arabic by Mahmoud Aghiorly
Reviewed by Faisal Jeber
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