Editing embryo DNA is an exciting landmark, but in reality will benefit few

Even if legal barriers were lifted, the conditions genome editing would help are rare, and our understanding of genes is still too poor for it to be widely usedIt is hard to overstate the importance of the moment. For billions of years, life on Earth has been shaped, slowly and incrementally, by dumb evolution. But in research this week, scientists showed how that might change. With advanced genetic engineering tools, a US-Korean team mended dangerous heart disease mutations in human embryos for