Jim Z. will present and moderate. The Stanford Encyclopedia of Philosophy says that:
Karl Popper is generally regarded as one of the greatest philosophers of science of the 20th century. He was also a social and political philosopher of considerable stature, a self-professed ‘critical-rationalist’, a dedicated opponent of all forms of scepticism, conventionalism, and relativism in science and in human affairs generally, a committed advocate and staunch defender of the ‘Open Society’, and an implacable critic of totalitarianism in all of its forms.
One of the many remarkable features of Popper’s thought is the scope of his intellectual influence… [read whole entry…]
For more on Popper and his philosophy, see here, a jointly run British Science Museum — Encyclopaedia Britannica website devoted to Popper and his ideas.