
But I have noticed that a lot of times, ones that don't hatch have some

Another one here. My mother taught me not to wash the eggs if you wanted to set them. Takes away that natural coating, bloom I think its called. And that washed eggs won't store as long as unwashed. Now she also taught me that if they were really badly smeared, wash them and use them sooner.
One more of Mom's wisdoms, to store eggs, rub them with cooking oil. Keeps the air from percolating through. When she was a kid, in the fall, they would do this so they would have eggs in the winter when the chickens weren't laying. went in the store room with the canned vegetables etc.
Anyone else have any observations, thoughts on this stuff?