We have lots of reference resources (encyclopedias, dictionaries, handbooks, and biographies) in print and electronic format. Reference materials are excellent resources to use for speeches because you can find quick facts and summaries with minimal effort. Think Wikipedia but more reliable and academic. Librarians can point you to some specific reference resources that will add a little zest to your speech.
Ask a librarian to point you to reference resources on your topic. There are too many to highlight here.