VATICAN CITY - Scientists told a Vatican conference Tuesday that screening embryos for disease before implanting them in in-vitro fertilization posed grave ethical problems that could ultimately result in parents choosing the type of children they want. The warning, however, was rejected as unfounded by outside scientists. The Vatican conference, which ended Tuesday, focused on the ethics surrounding the handling of embryos before they are implanted in in-vitro fertilization procedures when they are just a few days old and a few cells in size. On Monday, Pope Benedict XVI told the conference that even such young embryos deserve the same...
