Karl Popper - Objective knowledge (1972)

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Whenever a theory appears to you as the only possible one, take this as a sign that you have neither understood the theory nor the problem which it was intended to solve.

Karl Popper
The difference between the amoeba and Einstein is that, although both make use of the method of trial and error elimination, the amoeba dislikes erring while Einstein is intrigued by it...

Karl Popper
Only a man who understands science (that is scientific problems) can understand its history... Only a man who has some real understanding of its history (the history of its problem situations) can understand science.

Karl Popper
All science and all philosophy are enlightened common sense.

Karl Popper
The activity of understanding is, essentially, the same as that of all problem solving.

Karl Popper
From the amoeba to Einstein, the growth of knowledge is always the same: we try to solve our problems, and to obtain, by a process of elimination, something approaching adequacy in our tentative solutions.

Karl Popper
We should have to represent the tree of knowledge as springing from countless roots which grow up into the air rather than down, and which ultimately, high up, tend to unite into one common stem.

Karl Popper
It is the aim of science to find satisfactory explanations, of whatever strikes us as being in need of explanation.

Karl Popper