In the beginning was the spoken word, or so we are told. But, regarding science, whether social or "hard science", would not it rather be the relationship ?... Then should not we renounce the ambition of reaching things and beings in absolute terms, separate from the interactions which make them ? For many believe some sort of a new copernician revolution in relationist terms is under way in our way of thinking. Some 20 researchers question a new trend which tends to dissolve all substantiality (nature, social, subjectivity) into some sort of all-embracing relationism. (all texts in French).