In the classroom activity, students will be able to explain the difference between primary and secondary sources, and explain how the value of using primary sources is important to history. By using primary sources to answer a series of questions, they will see that, much like detectives, historians have to prove that their answers are correct by providing evidence. This activity is included in the online exhibition from the Smithsonian's National Museum of American History entitled The Star-Spangled Banner: The Flag that Inspired the National Anthem.