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Fascinating article about the evolution of the brain and nervous system in invertebrates, including a discussion of the astonishingly intelligent octopus and whether or not it can be said to possess a subjective consiousness:
The Octopus: An Alien Among Us
Self-replicating, bacterial life first appeared on Earth about 4 billion years ago. For most of Earth’s history, life remained at the single-celled level, and nothing like a nervous system existed …
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