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Since when have handkerchiefs been used? Detailed answer

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Since when have handkerchiefs been used?

Peculiar types of handkerchief have been used by man since very ancient times. Perhaps the first type of scarf was the tail of a jackal, which was stretched on a stick. Ancient people used it both as a handkerchief and as a fan. It is known that many wild tribes made mats from straw, which they wore on their heads and used to wipe off sweat. This was probably the very first use of a handkerchief.

In ancient times, in Greece and Rome, not only handkerchiefs were used, but also napkins. Napkins were used at the table for wiping hands. Handkerchiefs were rectangular in shape, they were put into clothes and used during travel.

In the XNUMXth century in France, handkerchiefs looked very elegant. They were lace and often decorated with jewels. When snuff became popular in the eighteenth century, women began to make handkerchiefs from colored fabric. Marie Antoinette persuaded King Louis XVI of France to issue a decree requiring handkerchiefs to be square instead of round, oval or rectangular!

Author: Likum A.

 Random interesting fact from the Great Encyclopedia:

How much sleep do you need to live long?

A study of the dependence of human life expectancy on sleep duration was conducted by Japanese physiologists

 After interviewing 100 adult residents of Japan over the course of ten years and then following their life expectancy, they came to the conclusion that those who sleep 7 hours a day live the longest. Already 8 hours of sleep leads to a reduction in life expectancy.

In this case, however, it is important not to overdo it: those who sleep 4,5 hours a day also shorten their lives.

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Each 3D printer is unique in its own way. 24.10.2018

As the experiments of researchers from the University of Buffalo have shown, the same objects made on different 3D printers can be quite distinguished from each other.

The authors of the work proceeded from the fact that each 3D printer, like the same typewriter, reproduces some of its characteristic prints over and over again. Therefore, you just need to understand what kind of prints they are, and learn how to "read" them. A series of identical objects were printed on different printers (14 in total), after which detailed images of each of them were obtained using a scanner. Upon closer examination, it turned out that each printed object had characteristic geometric parameters and texture features. By translating the obtained data into a numerical form, it was possible to calculate the degree of difference between one object and another.

It turned out that the mechanical features that affect the movement of the nozzle, the flow of material, etc. are all rather unique parameters for a particular 3D printer. Based on the totality of such characteristics, it is possible to compare the printed object with a specific apparatus with high accuracy. The researchers also tried to test what is called the strength of their method by testing ways in which you can erase individual fingerprints or try to pass off one device for another. It turned out that whether it is a change in the workplace and printing parameters, or a six-month break in the operation of the printer, or physical damage to printed objects - all this has little effect on the accuracy of identification.

3D printing, like many other things, can be used not only for good, but also for harm. Someone prints weapons, someone forges various parts or makes other bad things. Naturally, forensic scientists would like to have some methods to distinguish one printer from another by their products.

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