Learn how sex bias in biomedical research can impair our ability to properly diagnose and treat women for medical conditions and diseases, in this NOVA Next article. Across many fields of medical research, scientists consistently study more male subjects than females. This has caused scientists to ignore the effect of sex differences on diseases and drugs, which impacts how doctors effectively diagnose and treat women. Studying male subjects and then applying findings to females has caused a gap in our biomedical knowledge with potentially dangerous consequences for women. However, some of the organizations that fund medical research are creating new mandates to address this bias. This resource is part of the NOVA Next Collection.