DuckDuckGo is a general search engine that does not track user information. For example, if you search "hats," the search engine will provide links relate to hats, but it will not flag you as someone who is interested in hats (which often generates ads).
*Appropriate for: Middle school, high school
The DPLA is a collection of documents, videos, and images specific to United States history. The site also contains Primary Source Sets, which are collections exploring topics in history, literature, and culture.
*Appropriate for: Upper elementary, middle school, high school