Search engines help teachers and students quickly locate likely sources of information on a topic. But search engines operate in different ways, and some work better than others for certain types of searches.

Furthermore, the filtering software now included on many schools' computer networks may eliminate access to some search engines or dramatically reduce their effectiveness. Thus, teachers often use these search engines for their own research, which they then provide to students for follow-up reading and analysis.

Here is a comparison of the leading search engines, based on

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