Ten facts about eggs

1. Egg shell is composed of calcium carbonate, which is also the main ingredient in antacids, stomach acid compounds. The shell consists of 9 to 12 percent of the total weight of the egg, and contains pores that allow oxygen and expulsion of carbon dioxide.

2. Egg white consists mainly of protein albumen, and also contains niacin (vitamin B3), riboflavin (vitamin B2), chlorine, magnesium, potassium, sodium and sulfur. The egg white contains about 57 percent of the total share of proteins in the egg.

3. Yolk color is determined by the food consumed by chicken. The more yellow and orange pigments in grains that feed the chickens, it will be clearer color egg yolks.

4. Other colors in egg vary depending on its age and other factors. Egg whites are an indicator of how the egg is fresh. Pink or colorful egg whites show that the egg is rotten, and such eggs should be avoided.

5. Blood that can sometimes be seen in the egg comes from a small puncture in blood vessels in the yolk. But that does not mean that such an egg is not safe to eat.

6. Color of chicken sets the color of egg. White chickens are the most common type in the United States and they brood white eggs, while in Europe are more often chicken with brown feathers, and there dominate such eggs. No significant differences exist in quality.

7. It takes 24 to 26 hours that chicken broods the eggs. Eggshell is created in the chickens uterus. About 30 minutes after brooding, the process begins again.

8. The average chicken broods 250 to 270 eggs a year. Roughly 75 billion eggs is produced in the U.S. each year, 10 percent of world production. China is the world's biggest producer of eggs, and they annually produce 390 billion, or half of the world production.

9. Turkey brood eggs too, but it's harder to find their eggs in the market. Turkeys need more space to nest, so having them is not cost-effective, and also have strong maternal instincts than chickens.

10. Dinosaur eggs helped to solve the old riddle which was first. Canadian researchers have claimed that the egg came before the chicken, because dinosaurs formed nests and layed down eggs long before birds evolved.