A co-worker and her daughter have made a home made incubator for the science fair. They are in day 7 of their first batch and are concerned about the eggs. When they candled the eggs they got a dark area on the fat end of the egg and a clear area on the small end. There was a problem with a fluctation with the temperature but a heat shield was installed and now its much more even. So, is this what a "cooked" egg looks like? Dark on the top?? My co-worker wants to open one to see whats going on. Her daughter is telling her to be patient!!