http://www.merck.com/!!s9OfD17kBs9OwL2Wwl/disease/preventable/hepa/
A simple explanation of what causes hepatitis A, vaccination, and statistics.

http://www.merck.com/!!s9OfD17kBs9OwL2Wwl/disease/preventable/hepb/
Facts on hepatitis B(symptoms, statistics, spread, and prevention.

http://www.geocities.com/Paris/4664/introli.html
An explanation of lactose intolerance in laypersons' terminology with a few links to other sources of information about this condition.

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