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Measuring atomic and molecular interactions was one of the main objectives ofphysics during the past century. It was an essential step not only in itselfbut because most macroscopic properties can be derived once one knowsinteraction strengths. At the present time, except for systems that can bedescribed as discrete networks (like the Internet network) our knowledge ofsocial and biological ties still remains very limited. An important step is todevelop experimental means for measuring social and biological interactions. Inthis talk there are two parts. Firstly, we describe experimental evidence ofinter-individual attraction in populations of insects. Secondly, we focus on aspecific system, namely populations of Euglena gracilis, a green, swimmingunicellular organism, for which we try to determine individual and interactionproperties.

How can one measure group cohesion? From individual organisms to their interaction