A meta-search engine is one that submits your search query to multiple search engines simultaneously. DoubleTrust is one that combines results from the two most popular search engines: Google and Yahoo! It has some cool features, such as allowing you to indicate which engine you trust more, and the listing of “orphans” (sites which only appear in one of the engines.)
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Feldman, Barbara. "DoubleTrust." Surfnetkids. Feldman Publishing. 28 Jun. 2005. Web. 27 Aug. 2014. <http://www.surfnetkids.com/tech/688/doubletrust/ >.