She can wear a business suit or a party dress to change the impression. She can change her style, if she wants, every season. But what she can’t alter all that much is what Nature has given her to work with. Her foundation— her bone structure— isn’t going to change. And one strand of her hair, blond or black, will tell anyone with the right microscope who she is. It’s strange— mind-blowing even— to think that a person’s writing might contain something like this foundational DNA. While it is true the unique way that an author uses words is not quite the same as that author’s individual and biological gene expressions, years of research in authorship attribution and stylometrics have suggested that each of us has a fairly unique and individual linguistic fingerprint or style.