Eggs have porous shells, so it's best to keep them in the carton they come in or in a covered container in your refrigerator - don't use the egg slots in the refrigerator, or they'll become stale quicker, Fresh shell eggs can last four to five weeks after the expiration date without real loss of quality as long as they're in their cartons in the refrigerator.
In fact, the FAO Food and Agriculture Organization of the United Nations classifies eggs as the highest protein source, above other protein of a food by analyzing its amino acid content, its digestibility and the amino acid requirements of the animal species that eat it. With 100 as the standard for protein quality, an egg is rated at 93.7. Other foods include cow's milk (84.5), fish (76), beef (74.3) and soy (72.8). This means egg protein has the highest value for growth.