Hellow guys, Welcome to my website, and you are watching "두뇌 쉬어야 학습능력 향상에 도움" / YTN 사이언스. and this vIdeo is uploaded by YTN 사이언스 at 2014-10-23T22:52:16-07:00. We are pramote this video only for entertainment and educational perpose only. So, I hop you like our website.
