There are various types of rhetoric, but the four most prevalent are descriptive, explanatory, narrative, and persuasive writing. A description attempts to convey a concept so that the reader may precisely envision it. The expository approach attempts to convey a concept to the reader through evidence rather than views. A narrative uses stories to explain or justify ideas; these narratives can be fictional or non-fictional. Finally, a persuasive essay asks readers to make a decision about something by analyzing both sides of an issue. In research papers, the rhetorical mode is used to describe the nature of the paper's content. For example, a scientific paper would be written in the descriptive mode because it seeks to report findings regarding some aspect of science. An analytical paper would use the explanatory mode to analyze how concepts in one discipline relate to other disciplines. A historical paper would use the narrative mode by describing important events from history's vantage point. And a political paper would rely on persuasion by presenting arguments for or against issues before readers. These are only examples; many papers combine several modes in single works. Generally speaking, academic papers follow a standard format that includes a title page, a body, and a footer. The title page is composed of two parts: the running head and the copyright notice. The running head appears at the top of each page of the document and should give the reader a brief overview of the contents (i.e., topic, purpose, audience).