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The Open Society and Its Enemies
As one of the most important books of the 20th century, its a rigid defense of progressive democracy and an attack on the origins of totalitarianism. This book argues that the spirit of free, critical inquiry helps trace the roots of opposite, authoritarian tendency to a tradition described by Plato, Marx, and Hegel.
Popper, K (1945). The Open Society and Its Enemies. London: Routledge -
The Logic of Scientific Discovery
The Logic of Science was first published in english in 1959. Popper's view of science and his solutions to two fundamental problems of theory was the demarcation of science from non-science, and the role of induction in the growth of scientific knowledge, or how scientific knowledge rest on the doctrine of falsifiability. Popper, K. (2002) The Logic of Scientific Discovery. Routledge: Taylor and Francis Group -
Conjectures and Refutations: The Growth of Scientific Knowledge
This book published in 1963 is a collection of his lectures and papers that summarized his thoughts on the philosophy of science. It discusses how theories are ranked as scientific. K. Popper, Conjectures and Refutations, 1963, London: Routledge.
http://nemenmanlab.org/~ilya/images/0/07/Popper-1953.pdf -
Objective Knowledge: An Evolutionary Approach
This collection of essays represent an approach to human knowledge that has a profound influence on many recent thinkers. He argues that scientific knowledge is a separate entity that grows through critical selection. Popper, K. (1972), Objective knowledge: An Evolutionary Approach, Oxford University Press, USA -
Karl Popper's Falsification
Karl Popper believed that human knowledge progresses through "falsification".
https://www.youtube.com/watch?v=wf-sGqBsWv4
BBC Radio 4