The science behind sex in sports is far more complex than a simple male/female divide. This article explores the biology, history, and controversy behind sex testing in women’s sports — and why defining “fairness” isn’t so straightforward.

A behind-the-scenes look at how scientists use living human cells to study genes, biology, and sex differences. This article breaks down key lab methods—like LCLs and fibroblasts—into simple, real-world science.

At first glance, humans and cats may not seem to have much in common, but our biology connects us in fascinating ways. Learn about how our X chromosomes shape our traits!