Out of the two dozen I received 2 made it to lock down. On the 19th day I could smell one of the eggs from outside the room the bator is in So I had to open the bator to find out which egg smelled. I took each one out of the top window to smell, took the bad egg out (which was too dark to candle very well in the first place) At day 22 I candled the one egg left and there was no movement and the egg had not developed any more from day 18. I gave it another day, just for the hope!! Nothing. When I opened the egg the chick had quit developing about the time it should have started absorbing the yoke and it's intestines. But I noticed the yoke was very thick on one side of the egg, so thick it look like and "over-easy" yoke?? Could my flash light be that hot on the egg that is cooked it while I was candling? I know the light gets pretty warm, but is this possible? Another thing..... should the air cell be fully formed by week two? My air cells get big very quickly, I live in a low humidity area and I tried using a digital humidity/temp reader. My humidity seems to stay around 32% if I try the dry hatch method. Could the air cells be form too big too quickly and killing the embryos? The air cells fill the top of the egg and loop, making a U shape down one side of the egg. Is this too big? I have found some local eggs I am going to try hatching and see if I can't get a better hatch rate than with shipped eggs. So far my hatch rate is a big fat 0% Glad I bought some feed store chicks otherwise I'd still have no chicks at all!!