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Now that science is a big step closer to being able to fiddle with the genes of a human embryo, is it time to panic? Could embryo editing spiral out of control, allowing parents to custom-order a baby with Lin-Manuel Miranda’s imagination or Usain Bolt’s speed? (Belluck, 8/4)

This week, scientists reported that they had successfully edited harmful mutations out of genes in human embryos. It’s just the latest in a string of gene editing firsts facilitated by a system called Crispr-Cas9, which has enabled scientists, entrepreneurs -- even middle school students -- to snip, insert and delete genetic material with unprecedented precision and ease. (Murphy, 8/4)