How does caffeine keeps us awake?

in tedtalk •  8 years ago 

I never like coffe ... I like to function normal instead to function after drink or take something..

tedtalk caffeine drug
8 years ago by

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      ·  8 years ago 

    I used to drink 5 cups of coffee a day just to keep me going. I'm down to 2 now, but I can't imagine any is actually very good for you.

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