Eggs are a brain food according to a student presentation. The life cycle of an egg involves hens laying eggs that grow over 20 days until they hatch. Eggs are grown on farms and contain nutrients like protein, vitamins A and D, and cholesterol that can boost test scores by 12%. A patriotic cupcake recipe uses eggs, whipped topping, strawberries and blueberries. Eggs should be refrigerated to prevent aging and contain varying calories depending on how they are cooked.