31 of May is the world day of struggle with smoking . Smoking is the problem of the century.

Tobacco was brought to Europe by Christopher Columbus. At the beginning tobacco was attributed with healing properties but in Turkey, Britain and Russia in the XVII century was accepted the law providing strict punishmentv for people who smoke tobacco.

If to talk about the present time, in the United States and in the coutries of Western Europe and America observed a sharp tendency toward smoking restrictions. In Ukraine there is a low which prohibit smoking in public places. It is not allowed to smoke in elevator, in payphones, in institutions of healthy care, in educational and correctional institutions,at the playgrounds, in the entrance of residential houses and in public transport including trains.

Types of numbers

The number is one of the main objects of mathematics, which is used for counting, measuring and marking.

Geyser health - juniper pyramidal

In our polluted metropolitan areas there are increasingly appeared the blotches of evergreen plantings. Most of them are from a family of junipers, featuring a variety of shapes and forms, but the same property to clean the air.

Resonance - friend and foe

Resonance - this is a phenomenon of a sharp increase in the amplitude of forced oscillations of the system, which occurs when the frequency of the external force becomes close to certain values (resonance frequencies), due to the properties of the system.

Prevent a fire!

More than 6000000 fires occur  in the world every year. About 60 thousand from this number  are  in Ukraine. Fires have always been one of the most severe national calamities. In the Middle Ages the major cities of Europe systematically  were devastated by fires.

Hacksaw as an argument of designer

Famous engineers of the past combined deep fundamental training in physics, mathematics, chemistry, materials science, strength of materials, design with daily practice and a deep knowledge of production. As a result, they do not just knew and loved his "child", but also "feel" them.

The Formula of security. If you have gas in the apartment ...

The greatest numbers of accidents during the usage of gas at home happens because of the unauthorized equipment powering or the repair of gas appliances, the installation of additional gas appliances in violation of safety requirements, the setting of compulsory exhaust systems in kitchens and

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