This document provides information on how historians research the past using primary and secondary sources. It defines primary sources as artifacts, documents, photos, etc. created during the time being studied, while secondary sources are materials created after the fact, often based on primary sources. Examples of each are given. The document emphasizes using multiple sources to get a more accurate understanding of history and corroborate information. It also notes the importance of considering context clues like author, date, purpose when evaluating source reliability. Researchers are encouraged to make educated guesses about the past based on primary evidence and look for corroborating details from other sources.