  Antineutrinos born inside the Earth (``geoneutrinos'') carry out information
of fundamental importance for understanding of the origin and evolution of our
planet. We show that Baksan Neutrino Observatory is one of the best sites for
detection and analysis of geoneutrinos using large liquid scintillation
spectrometer. Also we present a short story of concept of Earth as antineutrino
source (1960 - 2004 yy)
