# Numerical giants

In our time of rapidly developing technologies it is difficult to surprise a person with anything unusual. Therefore, we sometimes do not pay attention to the world around us, which since ancient times "inhabit" **numerical giants**. They are present everywhere and even inside ourselves - we only need to be able to examine them. The sky above our heads, the sand under our feet, the air around us, the blood in our body - everything hides in itself invisible numerical giants.

For most people, the numerical giants of the celestial spaces are not unexpected. Not without reason the expression "astronomical number" became winged. The number of stars in the universe, their distance from us and each other, sizes of stars, weight, age - in all these cases we meet with numerical giants that suppress the imagination. However, many do not know that even those celestial bodies, which astronomers often call "small", turn out to be real giants, if we apply the earthly measure to them. Take, for example, a planet with a diameter of 3 km. It is easy to calculate that the surface of such a body encloses 28 square km, or 28000000 square m. At 1 square m can fit a person standing 7. As you can see, on 28 million square meters. m there is a place for 190 million people!

Sand on the seashore also introduces us to the world of numerical giants. The ancients made the mistake of counting the number of sand equal to the number of stars. It is known that with a simple eye we see in the sky only about 3500 stars (in one hemisphere). Sand on the seashore is millions of times more numerous than the stars available to unarmed eyes.

Numerical giants hide in the air we breathe. Each cubic centimeter of air contains 27 quintillion (ie 27 with 18 zeros) of the smallest particles called "molecules". It's hard to imagine how great this number is! If there were so many people on Earth, they would literally be out of place. In fact: the surface of the globe, counting all its continents and oceans, is 500 million square meters. km. This is 500000000000000 square m. By dividing 27 quintillion by this number, we get 54000. That is, for every square meter of the earth's surface, we would have had more than 50000 people!

Numerical giants live inside the human body. For example, if a drop of human blood is considered microscope, then it turns out that there are a lot of small red corpse floating in it - erythrocytes, which carry oxygen through the body and give blood coloring. In 1 cu. mm of their blood is 5 million. In the human body, about 14 times less blood liters than kilograms in his body weight. If a person, for example, weighs 40 kg, then the blood in his body is about 3 liters, or 3000000 cubic meters. mm. Hence the total number of red blood cells: 5000000 x 3000000 = 15000000000000!

15 trillion blood corpuscles! If you put them in a row one to another, then the length of such a series would be 105,000 km. It could be wrapped around the globe at the equator: 100000/40000 = 2,5 times!

In addition, the total surface of red blood cells is many times greater than the surface of the human body and is 1200 square meters. m. Therefore, they can capture and release oxygen on the surface, which is a thousand times larger than the surface of our body! This fact is very important for the life of our body.