When and where did the first folding knives appear? Detailed answer

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When and where did the first folding knives appear? Detailed answer

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When and where did the first folding knives appear?

In 1891 K. Elzner, owner of a surgical equipment company, discovered that pocket knives for the Swiss army were made in Germany. He decided to found

Association of Swiss cutlers and developed a model of a soldier's knife with two blades. The bright red handle was supposed to make it easier to find a knife among other ammunition.

Author: Mendeleev V.A.

Random interesting fact from the Great Encyclopedia:

Who was the first to vaccinate?

One day, in 1768, a young thrush woman came to a Gloucestershire doctor for a consultation. During the conversation, smallpox was mentioned, causing general fear in those days. The thrush noticed that she could not catch it, because she had already had cowpox, a disease whose symptoms were the same as those of smallpox, but it proceeded in a much milder form. The importance of her remark did not escape the attention of Edward Jenner, who was present when the young medical student spoke.

The idea completely took over his mind. Having received his diploma, he returned as a practicing physician to his small village in Gloucestershire in 1773, where for the next twenty years he devoted all his free time to research and experiment. He found out that the thrush was right - cowpox survivors very rarely got real smallpox.

In 1796, he did the first experiment, which was that he inoculated people with cowpox in order to subsequently protect them from smallpox. In 1798, for the first time, he made the most important experiment: first, cowpox was vaccinated in four children, and then real smallpox. To his great joy, none of them fell ill with this terrible disease.

Vaccination, or inoculation, was his great discovery, which made it possible to almost completely get rid of this disease. At first, vaccination had many opponents, but eventually its necessity became so universally recognized that in almost all civilized countries in our time the entry of foreigners is allowed only on the condition that they have received all the necessary vaccinations.

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Apple and Google have completely switched to renewable energy sources 11.04.2018

Apple announced that it has completely switched to renewable energy sources.

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