Let's do a myth buster test on the grocery store eggs. I have heard that you can take grocery store eggs and actually hatch them. I would really like to know if that is true so next time y'all incubate try it out and post your findings.
It depends really, from the regular ones you can't, they're infertile.. But the fertile eggs some grocery stores sell you can hatch, maybe not as good as fresh eggs, but it has been done. Do a search here and you may can find the post.