How many bones does the man?
The human body is supported by exactly 206 pieces of bone. Most of them are concentrated in the upper and lower extremities - 118 bones, the skull - 28, counting the ear bones, vertebrae -26 - -24 -. and ribs
How heavy is air?
The air we breathe is heavier than it appears at first glance, as evidenced by the process of filling a compressed air bottle to practice the sport of diving. The air compressor pumps into the steel cylinder of 15 liters at atmospheric pressure, a total of 3,000 liters of air, ie, three cubic meters. The gas pressure reaches 200 atmospheres or, that is, about 200 times normal atmospheric pressure at sea level. Placing the bottle on a full scale, we can see that his weight has increased about four kilos. It follows that, under normal conditions, since it must be remembered that the hot air is lighter than cold and wet more than dry, and at an altitude equivalent to sea-level heights rising air weighs less and less, "the gas we breathe weighs 1.3 kilos per cubic meter or, what is the same, 1.3 grams per liter (the exact weight is 1.2928 grams per cubic decimetre). If we count all the molecules of the atmospheric layer that surrounds the Earth, we obtain a value of 5,000 billion tons!
How many cells does a person?
Although no one has told, it is estimated that our body is formed by a whopping 100 trillion cells, ie, a one followed by 14 zeros. Each of them contains a DNA molecule enclosed in a kind of hood which is the cell nucleus, except red blood cells or leukocytes, which are hollow to carry more oxygen. Biologists estimate that every day we lose a total of 440,000 million cells are immediately replaced by new ones. Only bone marrow produces 13 million blood cells every hour. This is not true for nerve cells or neurons, which initially do not regenerate. We know, for example, that alcohol intoxication or drunkenness are lost forever hundreds of thousands of brain cells.
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