On Christmas day, 1993, a 59-year-old British woman gave birth to healthy twins. In Italy the very same week, a black woman bore a white baby, produced from the semen of her white husband and an egg donated by a white woman. Heated debates ensued across the United States and Europe.
Fifteen years ago the very idea of conception outside a woman's womb triggered science fiction fantasies and alarmist speculations. Today, thousands of babies...