@Vlogger How does caffeine keep us awake? – Hanan Qasim How does caffeine keep us awake? – Hanan Qasim View full lesson: http://ed.ted.com/lessons/how-does-caffeine-keep-us-awake-hanan-qasim Over 100,000 metric tons of caffeine are consumed around the world ev… 원문보기 ted, TED-Ed, Ted Education, TED Ed, Hanan Qasim 2019/07/12…