Very soon we hope to have some chicks hatch out of the eggs we have been incubating. It has been a fun family project either way.
The other night the boys candled some of the eggs and were able to see some that had stopped developing, some that continued to develop and some that were infertile.
Everyone likes turning all the lights out and taking a peek into the eggs. See that dark spot. We think this egg stopped developing. We found several of them that looked exactly the same way. Possibly from not rotating them enough throughout the day. The others were completely filled up with dark (the chick) except for a tiny light spot where the egg sack would be.
We are awaiting anxiously to see what happens
http://urbanext.illinois.edu/eggs/lessonplan.html
I thought you might enjoy this link for Egg based lesson plans and activities.