Barely two months old, little Adam Nash has already made history. The Colorado infant is the first test-tube baby from an embryo screened and selected for implantation from among several competing embryos in order to provide matching tissue for an ailing older sibling.
Without dramatic intervention, Molly Nash, 6, who suffers from a blood disorder that leads to dangerously low blood-cell counts and constant fatigue, could have died within a year. Her only hope was a bone-marrow transplant, preferably from a genetically matched sibling.
Last year Molly's parents underwent in- vitro fertilization to try to create just such a...
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