Where should a transgender schoolgirl be allowed to pee? To some, this may sound like a minor, insignificant question, but not to Nicole Maines, a 15-year-old transgender girl who attended Maine public schools. Born a boy biologically, Maines now self-identifies as a girl, dressing in girls’ clothing and sporting a typical 15-year-old girl’s hair and makeup. In addition to the harassment she faced from other kids, Maines also met intolerance by school officials, who refused to allow her to use the girls’ bathroom. Instead, in a remarkably insensitive decision, the school required her to use a staff bathroom after a...