Style is usually considered to be the province of literary writers. Novelists such as Ernest Hemingway and William Faulkner and poets such as Emily Dickinson and Walt Whitman are well known for their distinctive literary styles. But journalists, scientists, historians, and mathematicians also have distinctive styles, and they need to know how to vary their styles to fit different audiences. For example, the first-person narrative style of a popular magazine like National Geographic is quite different from the objective, third-person expository style of a research journal like Scientific American, even though both are written for informational purposes.