Alireza Edraki spends weekends in the lab. It\u2019s what he does. For the past three years, test tubes full of bacteria have been his constant companions. Not this weekend. \u201cI\u2019m so stressed out that I can\u2019t work,\u201d he says. Edraki is a third-year PhD candidate at the University of Massachusetts\u2019 medical school in Worcester. You know Crispr/CAS-9, the gene-editing technology that\u2019s in all the headlines lately? That\u2019s what Edraki works on.