A pregnancy test detects the presence of the pregnancy hormone human chorionic gonadotropin in a person’s body. The body doesn’t produce that hormone until several days after conception.

It is surprising to see a scientist who has taught biology for 30 years use such an analogy to conclude that life does not begin at conception, especially since every biology book I have ever read ...

It also highlights the nuances of human reproduction, whether it be fertilization in a fallopian tube or conception assisted by a little bit of science.