We live in the era of the dynamic development of astronomical observation techniques. We can see the universe not only through electromagnetic radiation (from radio to gamma rays) but also through gravitational waves. As rich as the observational data is, however, it still shows us only the fragments of the cosmic machine and to understand how it works we have to support ourselves with additional tools such as numerical simulations. In my talk I would like to present the population synthesis method which is one of the methods that helps us to put the observational pieces together. I'll introduce the method without getting into technical details and show 3 examples of its application. I will also touch on the hot topics of the binary stars evolution and the links to other branches of physics.
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