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In a complex and constantly changing world, we must develop complex thinking in order to face contradictory and interdependent demands that foster tensions between today’s and tomorrow’s needs, emergence and planning, social aims and financial performance. The COVID-19 crisis, by questioning the balance to be struck between protecting health and guaranteeing freedoms, between the development of human activity and respect for natural balances, has highlighted the dynamic balance which seems to have to guide living beings to ensure their sustainability by virtue of adaptability, in a context ontologically riddled with paradoxical tensions. These tensions arise in particular from the confrontation of paradoxical assertions, needs, and desires of the various entities involved (cells, environment, people, social body, companies, etc.), generated by their interactions: everywhere and for everything, the fact of belonging to a system made up of relations that are both complementary and interdependent leads to movements of permanent adjustments, between harmony and compromise, chaos and stability, reason and justice, to preserve the stability of the whole system. The researcher is therefore prompted to think of new approaches/methods for managing these paradoxes. The contributions to this second issue of Revue CONFLUENCE: Sciences & Humanités provide reflections on these approaches, on the concept of dynamic equilibrium and on the imperative, or not, of maintaining dilemmas or paradoxes.