If you close your eyes and think about it for a while, as philosophers have done for centuries, the world of the mind seems very different from the one inhabited by our bodies. The psychic space inside our heads is infinite and ethereal; it seems obvious that it must be made of different stuff than all the other organs. Cut into the body, and blood pours forth. But slice into the brain, and thoughts and emotions don't spill out onto the operating table. Love and anger can't be collected in a test tube to be weighed and measured.
Rene Descartes,...
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