Which famous military building is guarded by civilians? Detailed answer

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Which famous military building is guarded by civilians? Detailed answer

Big encyclopedia for children and adults

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Which famous military building is guarded by civilians?

Despite the fact that the Pentagon is the headquarters of the US Department of Defense, the building itself and all its employees are guarded by a special agency, PFPA, staffed only by civilians.

Authors: Jimmy Wales, Larry Sanger

Random interesting fact from the Great Encyclopedia:

What practical use did the earrings in the ears give to the pirates?

Traditionally, sailors were allowed to wear an earring after their first crossing of the equator or after they had rounded Cape Horn. Many of them believed that the earring is a talisman that protects against seasickness or prevents its owner from drowning. However, many pirates wore this jewelry for practical purposes - in the event of their death, the earring became a payment for transportation to their relatives so that they would be properly buried. And the pirates who were in charge of firing cannons found even more banal uses for them - earrings served as earplugs during a loud shot.

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In modern agriculture, technological progress is developing aimed at increasing the efficiency of plant care processes. The innovative Florix flower thinning machine was presented in Italy, designed to optimize the harvesting stage. This tool is equipped with mobile arms, allowing it to be easily adapted to the needs of the garden. The operator can adjust the speed of the thin wires by controlling them from the tractor cab using a joystick. This approach significantly increases the efficiency of the flower thinning process, providing the possibility of individual adjustment to the specific conditions of the garden, as well as the variety and type of fruit grown in it. After testing the Florix machine for two years on various types of fruit, the results were very encouraging. Farmers such as Filiberto Montanari, who has used a Florix machine for several years, have reported a significant reduction in the time and labor required to thin flowers. ... >>

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Random news from the Archive

Interaction of radiation with water 09.01.2020

For the first time, physicists have been able to trace how radiation destroys water molecules.

Chemical reactions in nature last very quickly - tens of femtoseconds, quadrillionths of a second. During this time, the atoms in the molecules of the initial substances have time to carry out interaction processes and take their new positions. At the same time, the electrons in them interact even faster - in tens or hundreds of attoseconds, thousandths of a femtosecond.

Scientists have been able to start studying these processes with ultrafast lasers and particle accelerators, which can produce ultrashort bursts of X-rays and gamma rays a few femtoseconds long.

Physicists at the Argonne National Laboratory have used these devices for the first time to see how radiation interacts with water. Experiments have shown how gamma radiation knocks electrons out of its molecules.

"For the first time, we have followed the fastest chemical reaction that can occur in ionized water - the birth of a hydroxyl radical (-OH). The study of such an ion is important, since it easily penetrates through various barriers in the body and can damage all important biomolecules, including including RNA, DNA or proteins," says Linda Young, one of the authors of the work.

After a photon knocks out an electron from a water molecule during interaction with other substances, it acquires a positive charge and attracts its neighbors. When one of the neighboring molecules approaches it at a sufficiently close distance, an ultrafast reaction occurs, during which a charged water molecule gives up one of the protons and decays. This results in hydronium, a complex compound of proton and water (H3O+), as well as an OH ion, which instantly combines with the previously ejected electron.

The experiment with a water molecule was carried out using an ultrafast and powerful X-ray laser LCLS. Moreover, in such an experiment, it serves both as a source of ionizing radiation and as a means for studying the process of destruction of water molecules.

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