A really incredible primer on allergy. Probably all, or more, than most people want to know, and that's not even including all the links within and around the article.

This is a comprehensive article that covers ALL aspects of allergies. This article details what an allergy is, what parts of the body are affected and why, types of allergies, and much, much, more. All of your basic allergy questions can be explained by reading this article.

This article is very readable in that it breaks down allergy information into several different sections. At the same time, it contains very comprehensive information. I think seeing a mix of the two is rare. Usually articles that go into biochemical causes of conditions,and treatments, are a bit dense and difficult to get through.