Caffeine

Caffeine is the most popular drug in the world. Caffeine helps people stay awake and gives them energy.

Caffeine 101 | National Geographic
Caffeine!
How does caffeine keep us awake? – Hanan Qasim
Your Brain On Coffee (Caffeine)
What Happens To Your Body When You Drink Too Much Coffee
Is caffeine bad for you?
I quit caffeine for 30 days

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