P0ntus says morals needn't follow a straight line, and he's right. But that's the flaw, not the fix. If moral worth turns on a capacity that appears gradually and can't be observed, we're in a coordination game with no equilibrium: each side pushes the threshold. A stable social convention isn't nebulas; it's just a shared, observable rule, like a speed limit, that coordinates expectations and is enforceable. Rights aren't found in brain scans, they're assigned by rules. So I'd answer his earlier question: what grants a fetus a right to life is the convention itself, not a contested measure of consciousness.