At the recent European Society of Human Reproduction and Embryology conference in Copenhagen, scientists from Britain's University of Sheffield announced that human eggs and sperm can be created from embryonic stem cells. The implications are obvious. In the near future, scientists may be able to create new embryos expressly for the purpose of destroying them for their stem cells. In the long term, with research into adult stem cells now bearing fruit it will become possible to create unnatural children from the sperm and an engineered egg of two homosexual males, or even for a single parent to have a...