Trying to get the semester finished. Today I give an exam, tomorrow I give an exam. Next week, I get 22 Ecology papers to read and grade plus 16 Soils notebooks.

Some links about the immune system:
How stuff works - the immune system This is a good "layperson" link. I'm suggesting my general bio students visit it.

A more technical link is here

And a really fun site about neurobiology (you can find cool stuff like optical illusions and the story of the guy who took a railroad spike to the brain) is Neurobiology for Kids (but adults will enjoy it too).