Original: General information How Stuff Works : '' How Caffeine Works '' Erowid Caffeine Vaults Highly Caffeinated : The Caffeine Information Archive '' National Geographic January 2005 : Caffeine Caffeine Zone : Social and Medical info on caffeine and its effects .
Simplified: Others The Effects Of Caffeine Addiction Caffeine : How Stuff Works National Geographic January 2005 Erowid Caffeine Vaults #caffeine !