this is a great thread...my broody abandon her nest and we had to make a quick styrofoam incubator and i had just got done candleing all the eggs, all alive and then i go and drop a thermometer and boom badly cracked egg, i still am a little concerned cause when i pulled it out along one bad crack there appeared to be a little blood but i waxed it anyways then re-candled and it was still alive, dented right where the chick was sitting too. so i guess we will hope this works and candle it tomarrow. Thanks for the great info though........i really hope it works for us!!