LONDON — Nate Rae had always felt secure living openly since coming out as a transgender man in his late 20s — until a recent U.K. Supreme Court ruling on the legal definition of biological sex changed everything. Now, Rae — a PhD student and science communicator who grew up in a small Scottish town before moving to London — says he finds himself constantly weighing risks and assessing where it is safe — or unsafe — for him to be. In April, the court affirmed that under equalit

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