Directeur de recherche CNRS Ecole Normale Supérieure (Paris) since 1990 (previously, Professor of Computer Science at the University of Pisa), As logical mathematician, he has extended his interests from the foundations of mathematics and computer science to those of biology. His research group “complexité et information morphologiques “ (CIM) is concerned with theoretical problems of interface between mathematics, physics and biology. His talk will focus on the differences between life sciences and physical sciences related to the categories of causality and time. The role of irreversibility in the life sciences and the interaction between a multiplicity of elements in the production of effects make the above disciplines very difficult to compare with the physical sciences, whose principles are, instead, based on the repeatability and the reversibility of the analyzed phenomena.