“I’ll be honest with you, Captain: I don’t really know. Maybe I’m a mutant, a punctuated step in the long equilibrium of human evolution. Maybe I’m a fluke of the cosmos, or the product of alien tampering, or a harbinger of the future. “Some days I skirt the edges of the universe, or move past the limitations of simple four-dimensional space-time, and I feel like a demigod. Other times, I find myself standing on planets with no names, marveling at the scent of fresh air and the texture of cool grass beneath my bare feet, and I feel more human than I ever dreamed was possible. “Am I human? Or
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