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Coffee has a multitude of health benifits.
http://en.wikipedia.org/wiki/Coffee#Benefits
Consuming > 800mg of caffeine / day is the threshold for very bad. The half life of caffeine is 4 hrs.... so coffee in late afternoon not good for sleep.
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This is irrelevant: I love Wikipedia. I always wind up clicking on some link in the middle of a sentence then going from page to page learning stuff that I never had the desire to. It's great.