The term "gender" was first distinguished from "sex" in the 1950s, when psychologists began to discuss the idea of "gender roles"--behaviors and responsibilities given to people by a society rather than flowing from their biology. Over the last two decades, transgender people have expanded our understanding of gender even further, introducing to the mainstream the concept of "gender identity," an individual's understanding of their own gender. Along the way, there have been numerous debates and controversies (i.e., what is the influence of biology on gender, how does the media impact gender...

The term "gender" was first distinguished from "sex" in the 1950s, when psychologists began to discuss the idea of "gender roles"--behaviors and responsibilities given to people by a society rather than flowing from their biology. Over the last two decades, transgender people have expanded our understanding of gender even further, introducing to the mainstream the concept of "gender identity," an individual's understanding of their own gender. Along the way, there have been numerous debates and controversies (i.e., what is the influence of biology on gender, how does the media impact gender...