Readers question the biology of alcoholism and more

Your letters and comments on the September 3, 2016, issue of Science News

Gene and tonic

Lab rats bred to drink a lot or hardly at all have revealed 930 genes linked to a preference for alcohol, a recent study shows. Tina Hesman Saey reported the findings in “Rats offer DNA clues to a­lcoholism” (SN: 9/3/16, p.