How does the world's favourite drug actually work?
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Further Reading

Adenosine Effect Overview:
http://thebrain.mcgill.ca/flash/a/a_1...

Adenosine receptors:
http://onlinelibrary.wiley.com/doi/10...

General Caffeine Effects:
http://chemistry.about.com/od/molecul...

Toxicity:
http://coffeefaq.com/site/node/12