"We understand what kind of struggle it is," Jack Grafe told "GMA." A set of twin brothers who transitioned from female to male are sharing their story in hopes of helping others who may be struggling ...

Nick Reiner, who is suspected in the deaths of his parents, was being held on a murder charge, Los Angeles police said.

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 ...