Science settles the question at the heart of the abortion debate—that of fetal personhood—in favor of the unborn.

The most compelling argument for abortion is denying that the fetus is a person. If one can do this absolutely, then abortion is not wrong. If one rejects one of the above premises, I’d like to ask him to consider the following quadrilemma. We begin with two new premises: The fetus is a person or is not a person, and we either know it or we don’t know it. We end up with four possible outcomes.