What is the “two sources hypothesis,” or the idea that there exist only two sources of knowledge in the known universe: Darwinian natural selection and human minds? Does a “genetic programming algorithm” used to make a robot walk create knowledge? Thus begins our deep dive into Deutsch's Theory of Knowledge and particularly his "Two Source Hypothesis." Bruce hints that this is leading towards an investigation into the difference between a non-testable (or philosophical) explanation and a bad explanation as our series on knowledge continues. --- Send in a voice message: https://podcasters.spotify.com/pod/show/four-strands/message Support this podcast: https://podcasters.spotify.com/pod/show/four-strands/support