The section view of the trunk of a tree served the Polish magazine Secrety Nauki, dedicated to scientific divulgation, to explain the secrets of dendrochronology, the scientific discipline that determines the age of trees by determining the number of rings on their trunks. The study of these rings also makes it possible to find out the environmental vicissitudes that a tree experienced throughout its life (droughts, fires, abundance of rains, pests, diseases ...). Secrety Nauki is a very popular monthly publication, related since 2013 to the German publishing group Gruner + Jahr. Page(s): 10-11