First published in 1945 and never out of print, this is the second volume of one of the most famous and influential works of the twentieth century.

Hailed on publication in 1957 as 'probably the only book published this year that will outlive the century', this is a devastating criticism of the idea that there are fixed laws in history and that human beings are able to predict them.

First published in 1945 and never out of print, this is the first volume of one of the most famous and influential works of the twentieth century.

Karl Popper described Die Beiden Grundrpobleme der Erkenntnistheorie.