The book tells about the representatives of the Demidov clan, widely known for their scientific, scientific and technical activities and work in the field of organizing science and education. This is Demidov A.N. - a factory owner who has been extensively involved in improving the technology and technology of ferrous, non-ferrous metallurgy and mining; Demidov P.A. and Demidov G.A. - scientists engaged in research in the field of biology, creators of the first botanical gardens in Russia; Demidov P.G. - natural scientist, founder of the Demidov Higher School of Sciences; P.N. Demidov - founder of the Demidov scientific prizes; An.N. Demidov - organizer and participant of the expedition to Southern Russia. For readers interested in the history of domestic science and technology.