fly thousands of neurons are lost in an alcohol intoxication (drunkenness) 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.
Uros? Destruction of the earth When formed the Crab Nebula?
In 1504, Chinese astronomers observed a massive explosion in the sky
who could not explain. Today we know that this event space is
corresponds with the birth of a supernova, which has been called the Crab Nebula. Located at 4,000 light years from Earth, it expands at a rate of 125 million kilometers.
When the aurochs became extinct?
The cattle are supposed to be descended from the aurochs, a wild bull
jet-black, six feet high provided long, twisted horns
forward. Aurochs, the scientific name Bos primigenius, were systematically hunted down and eliminated
by man and replaced by his descendants
home. The last that remained were a herd in the forests of Poland
, but these cattle dwindled until in 1627 died on the banks of the Vistula the last copies.
"When the first newspaper?
The first newspaper came to light in the Belgian city of Antwerp in 1605. Titled
Nieuwe Tijdingen, latest news, he realized the battle of Ecker in which the troops of the Marquis de Spinola defeated the Nassau Mauritius. This new system will give news became popular, and publishers of Nieuwe Tijdingen decided in 1617 it started to go regularly. At the same time the appearance of newspapers in Hamburg, Vienna, Berlin, Augsburg and other central European cities. After them came the relations and newsletters. Finally, we must not forget that in fact the origins of newspapers dating back to the reign of Julius Caesar. Conceived in the year 59 a. C., the minutes reflected the day's top stories daily.
When does life on our planet?
If we refer only to the fossil evidence, we can say that the first organisms
appeared in the Precambrian period, almost 4,000 million years, about 600 million years after Earth was formed.
Paleontologists have found microscopic fossils of bacteria-like current of up to 3,500 million years old in South Africa and Western Australia. Even the most archaic strata of our planet, which are located in Isua, Greenland
, which are older than 3,800 million years, contain traces of biological activity
. All this suggests that life appeared on Earth very soon
.
