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Translation uses Google Translate to generate a machine-translated version of the article. Because this version is not part of Britannica’s original content system, tools such as Cite, Save, Send, or Read-Aloud may be disabled.

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Many topics are available at multiple reading levels, but some specialized subjects may have only one version.

Primary Sources and E-Books are available only in the Middle and High levels of Britannica School. Students accessing the Early Elementary and Elementary levels will not see these resources.

Reading level selection is controlled individually by each user. Changing the level adjusts the content only for that user.

Every article, image, and video includes a built-in citation tool that generates MLA, APA, Chicago, or Harvard citations.

From an article page, open the related section, and select the Teacher option to view correlated curriculum standards.

For the best performance, use the latest version of Chrome, Safari, Firefox, or Microsoft Edge.

Possible causes include slow Internet connections, outdated browsers, or network filtering.

Some resources require a PDF reader. If one is not installed, your browser may prompt you to download one.

The dictionary works by double-clicking a word within article text. It may not work on headings, images, or interactive media.

For best results, use the Print icon within the article toolbar, which opens a formatted print version including a citation.

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