I'm not 100% human, but it doesn't bother me. I had heart surgery that involved installation of a Dacron tube in place of an aorta. Dacron is a company that produces polyethylene terephthalate synthetic fibers, in other words a thermoplastic polymer resin. The same resin is common in plastic bottle production (imagine a 20 oz. bottle of coke). Here's the thing: I'm alive. Before worrying about being human I worry about being alive.
Do I consider myself human? Sure. At what point would I no longer consider myself human? If I ever upgrade to circuits and wires, without anything of my current body, then I'd be something else. A cyborg, or organism that uses both natural and artificial systems (like me!), is still human.
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