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Given this, it is hard to accept that evolution is NOT directional. The human being in all our complexity is but a branch on a bush, not the apex of a pyramid. But that means that we are, in fact, both integral and special to all of life. Rather than making us "only" anything, it makes us unique and privileged.
I love studying the brain and nervous system with my students--neurophysiology is at the very leading edge of biological reserach and I get to learn new things every day! Retirement? Bah!!!
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