Posted by: Thebear, just an agent of peas | December 1, 2010 9:17 AM "There is no black-and-white boundary between non-personhood and personhood — it's an arbitrary line drawn in a continuum."
I must respectfully disagree, or at least modify. There is one very easy defined line between personhood and non-personhood. It even has a special name and is revered as a special occations in all cultures I know of. It's called birth.
One modification though is that not all cultures reconize personhood at birth, it might come quite a bit later.
People who advocate personhood before birth are universally westerners who've lost the distinction between a person and a human.
Potentital isn't the same as the real thing.
Posted by: PZ Myers | December 1, 2010 9:40 AM Nope, birth is also arbitrary, and it has not been even a cultural universal that newborns are regarded as fully human. I've had a few. They weren't.