This video is somewhat technical medically, but understandable by nonmedical people. The Professor speaks rather fast. He is going over briefly medical studies that show the brains of trans sexual people appear to have the structure of the identified as sex instead of the one assigned at birth. He talks about how the studies were repeatable, and they were backed up by controls to rule out different causes. It is becoming more clear just as it did with same sex attraction being inborn and not an illness to be cured, the same is true of transgenderism. No wonder the teaching of these medical advancements and knew understandings terrify the fundamentalist religious right and why they are removing all advanced placement classes that talk about gender and sexual orientation. The ones demanding we retain only the ideas of the past, that we accept only what was understood even a century ago are unable to tolerate growth in what we understand. At one time mental illness was thought of as demon possession. I have little doubt that those who still push conversion therapy and others who think you can pray away sickness will change their minds even when science proves them wrong. Some people still fight against evolution and think creationism is legitimate. Hugs