Hellow guys, Welcome to my website, and you are watching '컨버전스'로 이해하는 위대한 현대 과학사 / YTN. and this vIdeo is uploaded by YTN at 2017-12-30T09:12:22-08:00. We are pramote this video only for entertainment and educational perpose only. So, I hop you like our website.
