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POPSA New Kind of Science - Stephen Wolfram (Lecture) worth watching, on cellular automata, complexity, randomness, nature, mathematics, science, biology, natural selection, networks, space-time, physics, causality, relativity, determinism, quantum mechanics, computational irreducibility, ... (not necessarily in that order) His book is freely available online: http://www.wolframscience.com/nksonline/toc.html (see also The Nature of Code )