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No I havent given up, thanks for the reminder. Simply put, personhood is having a natural, inherent capacity for performing personal acts.

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You used the word "personal" in the definition of personhood. That's a bit troublesome, I'd think. And "performing... acts"... that's a bit... vague, too.

So, anyway, how is a zygote a person by that criteria, but a heart is not? How is a sperm not a person?

And how exactly would a doctor use that criteria to determine if someone is dead or alive?