(Note: This interview first aired last year.) As more people today identify as non-binary, individuals often introduce themselves by the pronouns with which they identify. E-mails are, for example, sometimes signed with "he/him/his," "she/her/hers," or "they/them/theirs." Pronouns are now playing a prominent role in our gender politics. This may seem new, but linguists have been puzzling over pronouns for a century -- or longer. Conflicts over pronoun usage in this country go back at least to