publicly available courseware (lecture notes, handouts, slides, tutorial material, exam questions, quizzes, videos, demonstrations etc) from the world's universities, colleges and other educational institutes; other educational resources
The invisible web, or deep web, is estimated to be 500 times bigger than the searchable web and comprises databases and results of specialty search engines that the popular search engines can't index.
new search engine that also has useful tutorial on how to search and explanations of all the major search engines; good for college students to learn how to use Internet most effectively