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[Continuation ](https://busy.org/@leonid96/the-invention-of-devices-for-obtaining-fire)
Part Two
The invention of matches can be considered a really useful discovery. Without fire, our life is not possible, strange as it may seem. The invention is wholly owned by chemists. Nowadays, many kinds of matches are produced. This household, hunting, signal, for cigars, huge fireplace and others, as they say and all occasions.
There are other useful ways to obtain fire. Using an optical lens and sunlight. To make a lens you need two concave glasses. You can fill them with water if you suddenly found yourself on an island without civilization. Well, then the process as a child, you focus the light at one point and set it on fire. The principle is simple, the concentration of a large number of rays in one place, raises the temperature sufficient for ignition.
Helpful advice. A similar way you can cook food. You need a box, inside to cover the walls with foil, to reflect sunlight. Inside put the pan, cover the box with a transparent glass. It turns out a kind of concentrator of sunlight. For a couple of hours, the sun should heat the water to a boil. In this case, you can do without matches.
The modern way to get fire is through electricity. You need a battery and a piece of thin wire. The thinner the wire, the higher the resistance, the stronger the wire will heat up. The principle is like in an iron, only a thin wire can heat up to red and even burn out, thereby igniting, for example, paper. Is not that the number of ways to get a fire does not say its importance. You need to work hard to get fire. It's not a button to press on the remote control or turn off the light.
Fire is a very dangerous phenomenon, especially when it is in the hands of children. As the saying goes, children are not toys. There is a whole discipline "science of fire", which studies the nature and manifestations of fire, its classification and the flow of processes. Fires are classified into different categories, their fuels are grouped, identified and clearly defined. Understand and highlight the different types of fires - means to find out the best way to prevent and control them.
Interesting fact. In North America, an evergreen sequoia tree grows, which can not even reproduce without fire. People have to artificially create fires, so that the seeds can germinate.
***P.S. indeed, in this world there is nothing to belong to man. All that a person can do is use it by chance and by virtue of his capabilities. It is difficult to imagine how a person could come up with a speech. It's impossible. For example, think of at least a new phoneme and try to pronounce it. Antibiotics are an accident, and yet the right discovery and saves many lives, thanks to nature. But this is not human wit, in general medicine is a science based on trials. Every time it is not known how to end. Without a movie, a car, computers, a blockade and the Internet, a person can manage - all this from the category of entertainment and does not affect our life in any way. And it's very important that it works on electricity. Turn off the electricity and go back to the fire and a candle or a fire for cooking.
Fire is eternal, because its origin is in the physics of nature without the participation of man.
And all the devices invented by man are fleeting and unreliable in our world.


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