What people looked like a century ago: Modern technology has allowed scientists to get to the bottom of the truth
What did people from the past look like? Most often, the guideline for answering this question are pictures or verbal descriptions in documentary or fiction. But are they objective? Often…

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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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What did the ancient Roman city of Herculaneum look like, buried under the lava of Vesuvius?
Herculaneum is one of the three cities that fell victim to the eruption of Vesuvius in 79 year. The ruthlessness of nature, which destroyed the inhabitants and their homes, impresses…

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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.

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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In Israel, found a ring with a seal that belonged to Pontius Pilate
An unexpected statement was made by Israeli experts after a detailed study of archaeological finds discovered during the excavations of Herodion, a fortress built by King Herod. According to scientists,…

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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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