Caffeine Extraction From Tea - 搜索视频

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 every year. That’s equivalent to the weight of 14 Eiffel Towers! Caffeine helps us feel alert, focused, and energetic, even if we haven’t had enough sleep — but it can also raise our ...

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