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How Stuff Works: "How Caffeine Works"

Highly Caffeinated: The Caffeine Information Archive"

National Geographic January 2005: Caffeine

Caffeine Zone: Social and Medical info on caffeine and its effects.

Naked Scientists Online: Why do plants make caffeine?

The Physician and Sportsmedicine: Caffeine: A User's Guide

The Consumers Union Report on Licit and Illicit Drugs, Caffeine-Part 1 Part 2

Coffee: A Little Really Does Go a Long Way, NPR, September 28, 2006

Does coffee really give you a buzz? by John Triggs in the Daily Express April 17 2007

How much caffeine is in your daily habit? (Caffeine content in common foods and drinks) by Mayo Clinic Staff October 2007

How to determine caffeine in decaffeinated coffee by NIR spectroscopy