YouTube - Brian Barczyk from SnakeBytes.TV takes you through his technique on slitting Ball python eggs before hatching. Good info here. Oh, plus Tay Zonday.
Ball Python Eggs Past Hatch Date
Reptiles Canada - A discussion on incubators and thermostats takes place after a ball python clutch refuses to hatch after 71 days. The breeder checks the temperature to find that even though his thermostat was set at 88 degrees, the incubator is really at 78.@ Reptiles Canada