So, in the last 2 weeks I have read anything and everything I could find about incubators and hatching, development and eggs exploding. I found a cracked egg shell a couple of days ago and after candeling today I decided to take it out because the cracks were getting bigger. I also took out an egg that didn't have any veins showing (this was a white shell) and today is the 8 th day in the incubator. When do bad eggs start exploding? I also after the fact thought about using plastic wrap on part of the egg. So I will post a pic of the cracked egg for others to see what was inside. In the home made incubator that is housing a school science project I could see blob moving even though I held the egg still and was sure there was no movement on my part. The temp. has been all over the place and none of the thermometers read the same or close. This hatching stuff is really worrisome to me.