Abstract
Reflection on ‘quanta’ in the 20th century showed a world impossible to analyze from isolated elements, existing independently and without the observer and his/her consciousness. This suggested the assumption of a ‘broad sense of cognition’. The inductive-deductive method would historically overshadow ‘abduction’, an expression of invention, creation and intentionally contradictory thinking, open to lateral, less obvious and probable approaches. The need to redefine rationality has allowed the irruption of ambiguity, undecidability, incompleteness, contradiction and uncertainty in doing science, bringing it closer to the ‘opaque’ speculative figures of Lévinas’ ‘faces’, Ricœur’s ‘integral self’, Jonas’ attention to ‘Responsibility’ towards future generations, Morin’s urgency to ‘understand the human condition’ in its unprecedented ‘complexity’.