Okay, given that we have two homemade incubators, we have only gotten one baby chick out of four sets of eggs. The first bator was one my daughter made for a science class project. We set 12 eggs and had one hatch. About half of them quit half way through and we had three that made it to lock down but only one hatched out. Two other were fully formed and had absorbed the yolk completely but never pipped. Our second and third sets were both 12 eggs again and both hatches went to lock down with over half the eggs viable and still going, but none of them hatched. Our latest set we built a newer bator, cabinet style. We had no quitters until the day before lock down out of 8 eggs, four quit. The other four should have hatched two days ago. Two of them pipped, but on the wrong end of the shell, one never pipped and was upside down, and the fourth never pipped and had its ... insides outside of it. We still have 7 duck eggs going that will be ready for lock down in a couple of days and don't want to lose all of them too. So what the blip could we be doing wrong that we can't get them to hatch after growing the whole time? Our temps stay pretty constant at 99 to 100 with 40% humidity. Any ideas???