"Librarians, teachers and parents have told us how hard it is for students to understand web searching. Boolify allows students to visualize and interact with the abstract concept behind the search process--it is intuitive and easy to use with your class or in your library.
Search results are presented through Google's "SafeSearch STRICT" technology to prevent objectionable content from appearing in their search results. There are two important caveats: a) no filtering technology is 100% secure, as this blog posting astutely points out and 2) we are unable to control or modify the results that we provide, beyond the filtering settings available through Google."