Primary sources are first-hand perspectives by someone who was there or was witness to something. Biographies are a good example of a secondary source. They are books written about a particular ...

Primary sources have not been filtered, but secondary sources have been filtered. Examples of secondary sources include biographies, textbooks, documentaries, encyclopedias, books. What was going on ...

Molly: I suppose you could always visit the moon. Narrator: Or you could research secondary sources instead as other people may already have found the answer. Some things are difficult to research ...