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So trangenderism has a decent bit of science to back it up (if you don't agree -- this isn't the thread for that.) I haven't seen much science to back up the concept of gender being a spectrum though, nor that there is such a thing as gender fluidity. What do you guys think about this topic? Is there such a thing as genders in between (or orthogonal to?) man and woman? If so, what makes you believe that? Additionally, can gender be fluid (one day you feel male and the next day you feel female, or whatever in between?) Again, please post what makes you convinced of that scientifically rather than anecdotes. Thank you!