Hellow guys, Welcome to my website, and you are watching [다시보기] 4월 28일 (금) 오전 사이언스 투데이 / YTN 사이언스. and this vIdeo is uploaded by YTN 사이언스 투데이 at 2023-04-27T22:28:57-07:00. We are pramote this video only for entertainment and educational perpose only. So, I hop you like our website.