How Does the Body Defend Against Diseases?

Ever wondered how the body defends against diseases and other attacks?  In the following article from the Geeks are Sexy blog, learn the basic philosophy behind the immune system.

We live in a world governed not by the biggest creatures, but by the smallest. Our bodies act as vessels for all that we call “ourselves,” forming a barrier between “out there” and “in here.” While that barrier is not as simple as a wall or a single membrane, the philosophy is made real by a complex defense network called the immune system.

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From the Upcoming ueue, submitted by Geeksaresexy.