So here we are, on the finish line, day 21, egg has been rocking for a day or two. I get home for lunch and look to see if it's piped yet, nope. Then I notice the thermometer says 90. 90???!! And one corner of the 'bater is dark. Has the thermostat messed up? Try to turn up the temps and light never comes on! Luckily I had a extra 40w bulb, put in in and sure enough, the old bulb had burned out. For what it's worth, I designed the 'bater with a secondary 25W light that runs at all times to help even out the temps and luckily it also acts as a secondary heat source so if either bulb burns out one is still on. I think the egg will be ok, it only got down to 90 and I have heard of worse during power outages etc. Oh yeah....yes it's only one egg! There were others but they didn't develop?