Since ancient times, scientists and philosophers have pondered the fundamental question of what makes some organisms male and some female. Some hypotheses were at least plausible—Greek philosopher ...

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 ...

President Trump issued an executive order limiting gender definitions on Monday. On his first day back in office on Monday, President Trump issued an executive order declaring that the U.S. government ...

Several Republican lawmakers introduced legislation to clarify that the terms “male,” “female,” and “sex,” among others, refer to the biological distinctions between men and women when those words are ...