The most important and interesting thing in life is love. So much has been written about her, is it worth adding anything? Perhaps not, because everyone has their own love. Some are possessive, some are sacrificial, some are giving, some are taking everything and absorbing everything. In a word, it’s not love at all. Questions of male and female biochemistry called “Love” partly became fundamental when working on this book. It is based on real stories of people who tried to understand their love. We often in life pay more attention to what does not need it at all. Yes, nonsense. Life's necessities happen without our participation. This happens because what is important and truly necessary will always take care of itself, it does not need care. We fuss mainly over trifles, sometimes spending our whole lives on trifles, while the most interesting remains unnoticed, it floats by, leaving behind a trail of unfulfilled hopes and desires, life disappointments and grievances. The sad feeling of a wasted life in old age causes insomnia, dissatisfaction and the need for increased attention to oneself, because life is already at sunset.