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How Much Caffeine Is In These Popular Drinks and Treats?
Bet you can't guess.
Why Does Caffeine Wake You Up?
Find out how caffeine causes that alert feeling.
Key Facts In This Video
Scientists think that caffeine has been a part of humanity's diet since before the dawn of recorded history. 00:28
Caffeine fits into the same receptors in the brain as adenosine. 01:40
The half-life of caffeine in your body is about six hours. 02:55
Is Caffeine Good or Bad For You?
Should you cut down, or keep drinking it?
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