Gender identity is a personal, internal sense of gender outside of a strict male-or-female definition. It differs from biological sex, which is assigned at birth based on physical traits. For years, ...

This story appears in the January 2017 issue of National Geographic magazine. To a degree unimaginable a decade ago, the intensely personal subject of gender identity has entered the public square.

Health researchers began sharing warnings on social media several days ago, urging members of the community to make copies of ...