An elementary school principal issued an apology Friday after promoting a book about a transgender child to students as young as five years old.Stacy DeCorsey, principal of Excelsior Elementary School in Excelsior, Minnesota, suggested kindergarten through second grade students read “Jack (Not Jackie),” a story about a young girl who realizes she prefers to act like a boy, according to a YouTube video. DeCorsey then issued an apology on Facebook for suggesting the book after it “struck a nerve in the community,” and since deleted the original video.“One of the books I spoke about specifically, which has struck a nerve...