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The paper deals with Henri Poincaré’s approach to 19th century crisis in physics and philosophy. In the time, when old inquiries, especially in physics, were relativized by the new, especially physical ones, when new non-Euclidean geometry has been articulated and when the absolutistic theories of the universe were no more valid, Poincaré labeled scientific and philosophical truths conventions applying this notion to all human knowledge. We live than in the world of scientific, physical and philosophical conventionalism, all our thruths being just conventions, depending on the development of our knowledge.