to search or not to search

i have learned a lot recently about crawlers, human powered directories, spiders, and search engines in general. it is very interesting that search engines do not all index the same sites.  i guess i always thought they were searching the actual web, not an index of the web...very interesting.  i also did not know that they do not search libraries or article databases.  i guess that's why i have better luck doing research through the web and through the cass county library site.  the library site gives me more articles.  i really enjoy finding out how things work, so this was fun to check into. when i am trying to find important info, i will definitely be looking for a second opinion from now on.