According to Professor Ellenberg, mathematics is the science of not making mistakes, and it greatly influences our lives, even though we are not aware of it. Armed with the power of mathematical thinking, you can understand the true meaning of information that was considered correct by default in order to critically comprehend everything that happens. The book will be useful not only for those who are passionate about mathematics, but also for those who mistakenly believe that this science will not be useful to them in life. Published in Russian for the first time.