These are stories about little-known research and scientific models in Russian psychology. They provide an opportunity to look at psychology and psychotherapy in the context of evolution and physiology and will be useful for both the student and the practicing psychologist.How to work with depression, seeing its evolutionary function? What role did predators and hunting play in the origin of the nervous system? What innate personality traits predict political preferences? How and what words affect our immunity?These are pieces of the puzzle that I found separately in English-language scientific journals, books and lectures. They proved useful in my practice and over time developed into a relatively holistic vision of the psyche, rooted in biology. Here they are brought together to save the reader time and share this vision. The result is a text that I myself would like to read a few years ago.I called it a cheat sheet, because it is impossible to know everything, and each client case is an exam.