Exciting thread to read!!! Congrats to you all. My chickies are 26/28, due 4/5. Mini temp spike last night, still in therapeutic range. There's some awesome reading on Sally's site about chick neck position and how it elicits the simultaneous movement patterns associated with stabilization and movement in the shell for effective hatching. And an other article covering the O2/CO2 levels in the air space, with the chick actually having a build up of CO2 after pip, resulting in anoxia, resulting in muscle spasms which elicit the hatching mechanism. Fascinating read of perfectly choreographed events. When you read about the switch from oxygen exchange happening only on a vascular level to an air exchange model, and that the CO2 level is way high at that time, it makes you wonder how they survive at all, and lends credence to the position held by many that you do a chick no favors by helping it out of the shell. That being said, when I have a chick taking an extra long time from internal pip to external pip, will I help it? Most likely. But,after reading these 2 articles, it makes a lot more sense that once you make that external pip for a chick in distress, you're even more on commit mode to see it through with assistance.