Eggs are composed of several parts including the shell, membrane, egg white, and yolk. They contain many important nutrients like protein, fat, and various vitamins and minerals. Eggs come in various grades based on the quality of the yolk and whites, and sizes based on their weight per dozen. The color of the shell does not impact the nutritional value. Eggs should be refrigerated for up to 5 weeks, stored in their carton blunt side up and not washed until ready to use. There are many different culinary preparations for eggs like scrambled, fried, poached, and baked goods. Eggs can also be used as a binding, thickening, coating or leavening agent in various dishes.