There are 7 to 17 thousand tiny pores on the shell surface, a greater number at the large end. As the egg ages, these tiny holes permit moisture and carbon dioxide to move out and air to move in to form the air cell. The egg can also absorb refrigerator odors through the pores, so always refrigerate eggs in their cartons.
From time to time, the Colorado Egg Producers sends out information for educators and the general public. When you register you can select which group to join. You can remove your name from the address list at any time.