Washington University scientists recently collaborated on a study that found what might be the first biological explanation for varying sexuality in mammals. The study, published in last week’s edition of Nature, describes the effect of varying serotonin levels on sexual tendencies in mice.

Researchers at Washington University School of Medicine have found that the antibiotic Kanamycin (KM), which was previously believed to damage ears, actually has a protective effect against hearing loss in young mice when used in low doses. KM is an antibiotic used to isolate bacteria and treat a variety of infections. It can also lead to severe hearing loss in both human and animals, however.