This natural habitat is described as a safe place from enemies and other predators consisting of natural walls that lack something to complete this protective structure.
The door not only provides protection but also encloses the inner structure of the house or warm house.
The first recorded history of doors is found in Egyptian tomb paintings 4000 years ago.
Some of the heaviest doors in modern history have been found in bank vaults protecting large amounts of cash and even jewelry worth millions.
Despite this, the heaviest door in the world was not found in the bank, but actually in the laboratory.
The Lawrence Livermore National Laboratory is home to a 44-ton (97,000-pound) door that is 2.5 meters (8 feet) thick and 3.6 meters (11.8 feet) wide.
You would think that such a heavy gate would take a large person to open, but thanks to the smart technology hidden in the gate, it only takes one person to open it.
Lawrence Livermore National Laboratory – aerial view.
So what is behind the door?
What is so valuable that it takes a large structure to protect it?
Funny enough, the door was not made to protect the contents inside the lab, but to protect the world from what was inside the lab.
The Lawrence Livermore National Laboratory has been used for many years to test various metals and other materials at the neuron level.
The gate is used to prevent the rotation of the Target Neutron Source-II (RTNS-II) — the world’s most intense fusion neutron source.
Scientists from all over the world use it to study the properties of metals and other materials that can be used in deep fusion power plants expected for the next century.
The energy of this piece of technology involves a lot of radiation, so it is necessary to have a large and thick door, to stop the radiation from shooting out of the laboratory to the world.
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