I'm trying to prepare for fall classes and bringing out my old stuff, I had forgotten about this website that offers great science activities/experiments with most things needed laying around your house.http://www.exploratorium.edu/snacks/index.html
Also, minus the building an incubator, which can be purchased through http://www.hometrainingtools.com
for under $30.00, this next website was a great study on eggs. It gives everything that you may want to know about incubation & embryology including lesson plans, activities, (the building of an incubator), parts of a chicken and more.
Go to: http://www.urbanext.uluc.edu/eggs/index.html