Diamond Hard Science Fiction

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Above all, he dizzily marvels at the fact that the molecules in his brain have managed, collectively, to understand themselves: his neurotransmitters are part of a system that knows what a neurotransmitter is. He can sketch the structures of the central nervous system's one hundred most important substances; he's synthesised half of them with his own hands. He's even viewed real-time images of his brain metabolising radioactively-labelled glucose, revealing which regions were most active as he watched himself thinking about watching himself think.
Harold doesn't know quite what to make of this molecular self-knowledge. He can't decide if consciousness is miraculous or meaningless; he hovers between mystical ecstasy and the purest nihilism. Sometimes he feels like a robot, raised by human parents, who's just discovered the awful truth: poring over his own circuit diagrams, horrified but enthralled; scanning a print-out of his own software, following the flow of control from subroutine to subroutine; understanding, at last, the ultimate shallowness of the deepest reasons for everything he's ever done, everything he's ever felt - and dissociating into a mist of a quadrillion purposeless, microscopic causes and effects.
This mood always passes, though, eventually.