Although mammals and birds are widely regarded as the smartest creatures on earth, a very distant branch of the tree of life, the cephalopods, have also developed higher intelligence. How is it that a creature with a remarkable mind evolved through an evolutionary lineage so different from our own? The author is a philosopher of science and a scuba diver who explores the ocean world of squid, cuttlefish, and octopus to follow how subjective consciousness came into being -- and how nature became aware of itself.
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