The first public work with more than 100 scientific references, which finally addresses what “stress” really is. So mistreated, so misunderstood. At its base, at the very source, a set of biological molecules is this “stress”. It is the set of the reactive species, molecules that have gone through the ages, that live in each of the cells of all living beings. By Doctor Laurent Chatre, French scientist, researcher in biology, specialist in stress and bioenergetic metabolism.