Mohr Siebeck Gesammelte Werke in deutscher Sprache

This work, which many regard as Karl Popper's most important for the scientific world, is being published in a new edition as part of the Collected Works. In Popper's opinion, it is a mistake to consider scientific knowledge to be certain knowledge. He maintains that, on the contrary, scientific knowledge consists of bold speculations and of strictly examined but in reality provisional conjectures.