In contrast to boolean-based search engines, which use the logic operators “and” and “or” to define searches, natural language search engines use plain, old human English. So feel free to ask “Why is the sky blue?” or “Why does the dryer eat my socks?” Three examples of natural language search engines are Ask Jeeves (), BrainBoost and AnswerBus.
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Feldman, Barbara. "Natural Langues Search Engines." Surfnetkids. Feldman Publishing. 25 Nov. 2003. Web. 22 Nov. 2014. <http://www.surfnetkids.com/tech/165/natural-langues-search-engines/ >.