It’s not just about chromosomes. Or reproductive cells. Or any other binary metric. Many genetic, environmental and developmental variations can produce what are thought of as masculine and feminine ...

Add Yahoo as a preferred source to see more of our stories on Google. When you buy through links on our articles, Future and its syndication partners may earn a commission. A microscope image of the ...

For the first time ever, the Oklahoma Department of Wildlife Conservation has confirmed the presence of reproducing female mountain lions in Oklahoma — a historic milestone in the state’s wildlife ...

In this population-level cohort study of 20 low-mortality countries, females ages 35 to 60 experienced disadvantage in cancer mortality compared with males—a consistent pattern observed across birth ...

Pelvic Inflammatory Disease can begin with mild symptoms but may cause infertility if untreated. Doctors explain warning signs, causes and prevention tips.