Wow, I loved this little book and anticipate reading it again, in addition to attempting something from Popper himself. The author describes Popper's philosophy as a "philosophy of action" and contrasts it with other philosophical theories as deeply practical, truly a compass to live by versus an intellectual exercise that ends in a twisted puzzle of unanswerable questions. The book covers, in a concise 100 pages or so, his main fields of thought: science/truth, the evolution of knowledge, and politics. I enjoyed the former two the most but given the current state of politics in the US, I am interested to dive deeper into the latter.
Popper dismantles a question that has, according to the author, vexed philosophy for centuries - how science, and knowledge itself, is built on a faulty foundation. Criticisms of science, Popper later refutes, say it is built on inductive reasoning. You observe facts and when you see something enough times, you develop a theory. To use the analogy borrowed by Taleb's book "Black Swan", which drove me to find Popper, if you have a theory that there are only white swans and find only white swans for hundreds of years, then you convert it to a natural law due to massive accumulation of evidence. But it only takes one black swan to destroy this natural law. If science is built solely on past observations to predict the future, then you actually can't know anything because one new fact can overturn all knowledge. Popper turns this problem on its head by saying that science, and the search for truth, is actually the attempt to disprove what we know, the constant searching for evidence that is contrary to what we think we know. And that truth is actually unattainable, but we can only get closer and closer over time, less and less wrong. I love the idea of celebrating wrongness as a way to guide your thinking and his embrace of uncertainty as a fundamental aspect of being human, unsettling though it is.
The second area, the evolution of knowledge, was even more fun to read. He seems to say that evolution itself is simply life's efforts to solve problems and that, by extension, life is driven by problem solving. Life transforming from bacteria to more complex forms of life was driven by life adapting to problems, "solving" issues with how to grow and get energy. Over millions of years, animals begin making sounds to communicate, growls and snorts, another problem solving strategy. Eventually, in what he terms World 3 (World 1 is the physical world, World 2 is inside our minds, i.e., thoughts), humans invent language (among other things in World 3), a system that objectively exists but is outside of ourselves and over time evolves in unpredictable and uncontrollable ways, creating new problems to solve that we couldn't have anticipated. Math is in World 3, we invented the numbers 1, 2, and 3 to solve some problem, probably to keep track of goblets of beer to feed the workers or something like that, but the invention created new problems like the existence of odd and even numbers, prime numbers and exploding out from there the most complex concepts that even modern computers struggle to solve. And I think, knowledge is created, reason is created, and the search for truth is created with World 3. Art, politics, science, all that makes us human was launched with the creation of World 3. There is plenty more to say on this and frankly, I struggle to capture the implications, but it was fascinating.
The last section is on politics, evidently Popper wrote a devastating argument against Marx, and less successfully Plato, which seems to be founded on the impossibility of predicting the future or designing policy interventions that have the exact intended effects as predicted. This reality creates a terrible cycle for people driven to build a Utopia (Marxists) or those driven to go backwards to some nostalgic past and thus arrest further change, in which the adherents of those faulty ideas are forced to use violence to reach their aims but the goal is unattainable, and thus the spiral to chaos. Popper wants a society built on his view of truth, always being sought but never reached, and an admission that we will often be wrong, have unintended consequences, but where new approaches are welcome because we all know that only through experimentation and trying new things can we ever make life better for humans...or something like that, not sure I am nailing it perfectly here.