There are inventions that have become a colossal impetus for the development of our civilization and will never become obsolete. These include the wheel. All over the world it is recognized as one of the oldest and most important inventions of mankind! It is perhaps difficult to find another discovery that would give such a powerful impetus to the development of technology. The wheel and circle are the basis of many mechanical things. Imagine - the wheel has disappeared from our lives. The spinning wheel and the potter's wheel would immediately stop moving, the water wheels would stop raising water into the irrigation canals, and the millstones would stop grinding grain. All mechanisms running on gears would stop working. We wouldn’t recognize a cart, a bicycle, a car, or even an airplane. We would not have a single vehicle! Of course, in such a small work it is impossible to consider all the mechanisms where different types of wheels are used, but nevertheless, a lot of interesting and useful information awaits you.