To make models of human embryos and research our earliest days, scientists employ stem cells

To better understand the intricacies of early human development, prenatal medical issues, and why so many pregnancies fail, scientists have developed models of embryos.

These models cannot develop into children since they are generated from stem cells rather than egg and sperm.

Insoo Hyun, an ethicist and the head of life sciences at Boston’s Museum of Science, stated, “They’re complete enough to give you a picture of what may be happening in the embryo during pregnancy, but they’re not so complete that you could actually use them for reproduction.” It simply won’t work.