42:41 Is there a shadow biosphere? This video considers whether there might be a shadow biosphere, life that that arose independently from currently known life and that uses a radically different biochemistry. First I consider some ...
31:20 Philosophy of Science 7 - Scientific Revolutions This video details Thomas Kuhn's philosophy of science, which proposes a cyclical model of scientific development from normal science, to crisis, to revolution, then back to normal science. The imp...
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