Calculators have become a part of our everyday life. We increasingly use them when distributing the household budget, creating a daily routine and in many similar cases. The time is not far off when we, having thrown away centuries-old Russian traditions, will begin to resort to them in markets and restaurants - and thanks to this we will learn a lot of new things about ourselves and the world around us. And if we go even further and analyze with the help of a calculator, it would seem that situations that have long been known to everyone, they sometimes begin to look in such a new light and acquire such a new meaning that it is simply amazing. The author shares the results of some such calculations on the pages of this book.