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Search engines vary greatly in the number of web sites indexed, number of dead links, whether or not or what type of truncation, proximity searching, sorting, limits, and Boolean searching is permissible, etc. For a truly comprehensive search, conduct your search using numerous search engines.
| BoardReader | Search message boards. |
| Exalead | Has many unique features, e.g., truncation, proximity, phonetic search, approximate spelling. |
| Gigablast | See features |
| Advanced Search Tips | |
| Live search | Refreshes often. |
| Reference Extract | Syracuse University. Geared to an academic audience. Extracted from Scientific American, The Math Forum, NASA, SeaWorld, Earth & Sky, VRD, Learning Center, Internet Public Library, How Things Work, MadSci Network. |
| Yahoo |