The purpose of this section is to remind of what is important to population specialists, what deserves to be preserved in our memories. We are not the "Ivans with no memory of kinship." We remember our kinship, respect our history - the history of the Science School of Dmitry Ignatievich Valentey, respect and preserve the traditions of our Center for Population Studies of the Faculty of Economics of Lomonosov MSU, the 50th anniversary of which is only a little away.Anniversaries and round dates are a good occasion to recall the memorable dates of our teachers and colleagues, both living and those who had passed from this life, of their contribution to the development of population and demography economics, the neighbouring demographic sciences and the population knowledge system, to recall publications and conferences, laws and concepts, and all important to understand the ways in which modern knowledge of the country's demographic development and the world was established.And if you're considering how to begin a lecture or a new article, start with the "lesson" of memory ...