Producers' Note: A correction has been made to this audio to reflect the wishes of the subject of this story, Paige Abendroth. NPR's Invisibilia's originally included Paige's birth name in this piece due to a miscommunication between Invisibilia's reporter, Alix Spiegel and Paige. We have not been in contact with Paige directly, but NPR has issued the following statement from Anne Gudenkauf, senior supervising editor of NPR's science desk: "We would never have violated Paige’s wishes in this story; it’s an unfortunate misunderstanding. Invisibilia's upcoming episode on Paige will be edited to remove references to the name she no longer recognizes. Also the upcoming episode, which focuses on how categories affect us all, will explore in more depth the changes in Paige's life over the two years that she and Alix have spoken and will do that, as always, with attention to bi-gender and transgender reporting guidelines." Former Radiolab producer Lulu Miller and NPR reporter Alix Spiegel come to the studio to give us a sneak peak of their new show, Invisibilia. Invisibilia has an upcoming episode about categories, so Alix tells us a story about two very basic categories: boy and girl. We've heard lots of stories about the sometimes blurry boundaries between boy and girl, but Alix introduces us to someone who experiences those categories in a way that was totally, completely new to us.