Plumbing, civil rights and technology: What the world lost when the Greeks conquered Troy, and the arias - the Dravidians
The legends of dark times in Europe and Asia are full of enthusiasm for the lost civilizations, developed so high that the listeners of these legends could hardly believe. Much…

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Устройство канализации . Granitladen granite store countertopscolumbia.com.
How in ancient times did the bodies of the dead
As soon as a person dies, his body is usually buried or cremated. But in some ancient societies, the corpses after death in various ways used, or preserved their parts…

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Riddles of the Etruscans, who do not give rest to scientists
The people who inhabited the lands of modern Italian Tuscany a little more than two millennia ago, who called themselves “raseny”, left traces of a surprisingly rapid flourishing, and also…

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Russia's oldest idol turned out to be older than the Black Sea
The wooden figure found the Mesolithic - the middle stone age and was the oldest of the large surviving sculptures of mankind. An international group of researchers with the participation…

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Interesting facts about the entrance door

The need to protect their homes exists from time immemorial. Historically, in the gland, people have seen something so solid and durable, which can be protected. In the entire history of mankind, the technology of manufacturing door structures, as well as the materials from which they were made, changed many times. We will speak about such ordinary metal entrance doors, but as it turned out with a huge amount of interesting facts and a non-standard history.
Interesting fact number 1: in 2010 in Zurich (Switzerland), archaeologists discovered the front door, which is about 5 thousand years old. Thus, this find is the same age as the British Stonehenge. According to scientists, the door structure has survived to the present day due to the fact that at that time the harsh climatic conditions forced people to build their houses around the lakes, and this required strong wood.
Interesting fact number 2: the oldest wooden door, still in use, is located in Westminster Abbey (UK). It is reliably established that it is made of oak, felled in the 11th century. Thus, the approximate age of the door structure is about 10 centuries.
Interesting facts about the entrance door (5 photos)
Interesting fact number 3: throughout the world, metal entrance doors are divided into 13 security classes. And if the doors of safety class 6-7 are found everywhere in bank vaults, then the door steel system of safety class 13 is only in Fort Knox (USA). Fort Knox is a repository of US gold reserves. The steel product, which reliably guards the gold reserves of the United States of America, weighs 22 tons and is 1 meter thick. It is made of seven layers of steel, and it was boiled using secret technology.
Interesting fact number 4: the highest door in the world is located in the spacecraft shop in Florida (USA). It has a height of 140 meters, and 45 minutes is the approximate time of its closing / opening.
Interesting fact number 5: the most heavy door system is considered to be the metal structure, installed in the Lawrence Laboratory in California. Its weight is about 320 tons, and its thickness is almost 2.5 meters. And although it seems that with such a mass, only remote opening / closing is possible, but thanks to the special door hinges the system also opens manually.
Interesting fact number 6: the fastest closing door products installed in laboratories that work with explosives. In case of danger, they close in 0.3 seconds. Such high speed is provided by nitrogen compressed to 1000 atmospheres.

Primitive thongs, wigging pillow and other ancient things that have survived.
In the daily arsenal of modern man there are a lot of various inventions that make his life much easier. And few people think that many of these things appeared…

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Obelisk of the city of Aswan
Granite quarries, located along the banks of the Nile in the city of Aswan (Aswan), supplied some of the highest quality stones for the construction of temples, sculptures and monuments…

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