What: A deep dive from National Geographic on how menstruation ends up reshaping the brain. Every time it happens.

Why it matters: As one neurobiologist points out, women will experience “almost 450 menstrual cycles over 30-40 years,” which is a lot of change. And although women make up the majority of Alzheimers and depression cases, “only about half of one percent of brain-imaging research is related to women.”

Source: National Geographic