Male fertility is on a decline worldwide—and cat poop might have something to do with it. New research suggests that Toxoplasma gondii, a common parasite spread primarily through infected cat feces, ...

Male fertility rates have been plummeting over the past half-century. An analysis from 1992 noted a steady decrease in sperm counts and quality since the 1940s. A more recent study found that male ...

A parasite that makes rodents unafraid of cats could be giving people the courage to become entrepreneurs, researchers told NBC News. People infected with Toxoplasma gondii were more likely to have ...

Russell has a PhD in the history of medicine, violence, and colonialism. His research has explored topics including ethics, science governance, and medical involvement in violent contexts. Russell has ...