"The story of how we got from he and she to zie and hir and singular they. Like trigger warnings and gender-neutral bathrooms, pronouns are suddenly sparking debate, prompting new policies in schools, workplaces, even prisons, about what pronouns to use. Colleges ask students to declare their pronouns; corporate conferences print nametags with space for people to add their pronouns; email signatures sport pronouns along with names and titles. Far...