Puzzling cosmic signals, processed food defined and more reader feedback

To edit or not

A controversial paper about modifying genes in fertilized human eggs raised some serious ethical concerns. Tina Hesman Saey covered researchers’ arguments for and against this type of genetic engineering in “Editing human germline cells debated” (SN: 5/30/15, p. 16).

Many readers embraced the idea of making permanent changes to human DNA.