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They don't understand anything about the human body, but do understand the replacing of their cells every seven years, that just sounds rational to them
Like, engines are "born" fully grown and everything in place. And everything should stay in place. No parts falling off. Everything is perfectly secured and everything is the exact size it should be. Nothing changes except their mental age.
So imagine when they find out that humans grow from tiny to well, slightly bigger (Compared to them.) and everything inside them, organs and all, grows with them??? Or their teeth just fall out at a certain age and then regrow? Or that we can't just replace parts? Or at least, if we lose something, it won't be like before. Or how bout that we basically have no protection? We're just skin and bones? No protective metal and super strength to protect us. Unless we build it ourselves. But most people don't have a suit of armor sitting around their house. And yet, we somehow survived this world? What is this witchcraft?!? Lol! These must be weird concepts to them.