Ok. I went and bought some eggs from my uncle 20 days ago and put them in my homemade incubator. This is after my nephew "played pool" with the eggs while gathering them. The temperature outside was below freezing when we went to get the eggs and my nephew picked one up off the frozen ground and placed it in the bucket. I am at this point, questioning the health of these eggs I am getting! He opens the door to the henhouse and much to my dismay, the hens are laying their eggs on the floor, BELOW THE ROOST!! Now my confidence plummits, expecting at this point if I am extremely lucky, no more than 1/18 hatch rate. Some of these eggs look halfway decent so I don't turn these eggs down. Then, much to my utter horror, he begins "shooting" the eggs into the corner, so I now own some really shaken eggs with probably some cracks but neglect to check there condition. Now I arrive home and place the eggs into the un-tested incubator for my first time. The temp at that piont is managed by extra vent holes drilled into the side of the unit. You can probably imagine what the humidity is doing all the while the eggs are in there! OOps 108 degree temp spike, lets adjust this.....now it is 81 degrees...thinking at this point of seeing how far I can throw the eggs, but my dear wife convinces me to keep them in there as I have no other eggs anyway and maybe one will hatch. I get a water heater thermostat and get everything stabled. At this piont, we are around day 16. everything staying normal. THEN I DROP THE WHOLE CARTON WHEN I AM TURNING THEM AND CRACK A FEW!! day 18, I happen to look at the eggs for the 1000th time and SEE A PIP!! and it hatches. HUH, another...another... 8 pips, and I have had 7 hatch and live! one of them had a big ol' dent in the egg. now I am impressed. 50% hatch rate is not so bad for this batch. so now, hatchers, tell me, where does being finnicky with temp and humidity pay off?