Nietzsche questions truth as an adequate understanding of the world. This implies there is no longer a true world, as modern sciences assume. Radical constructivism, emerging in biology, which posits that living beings perceive their environment only as their internal structures allow, confirms Nietzsche's analyses and, consequently, postmodern philosophy, where truth is also considered merely a construction and not an objective grasp of something. From this, it follows not only that the world can be interpreted in various ways, but also that there is no single, uniquely correct truth and, therefore, no single correct way of life.

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