"But Tantalus, are you saying there are individuals who have more humanity than others?!"

Tantalus Prime and I have had a discussion about the moral status of abortion and the scientific status of the human embryo (shorthand for human zygote/embryo/fetus).

Tantalus has expended quite a bit of effort to deny that human embryos are human beings. My recent post pointed out the absurdity of asserting that human embryos are anything but human beings. And I asked Tantalus this question:

What is a human embryo?

My question is a scientific question, not a moral question (yet). The a...