As we celebrate the nation’s 250th birthday, test your civics knowledge and see how your score compares to others.

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This will install the extension under the _extensions subdirectory. If you're using version control, you will want to check in this directory. Then use the following syntax within a slide to create a ...

To continue reading this content, please enable JavaScript in your browser settings and refresh this page. Preview this article 1 min The rise in popularity of Open ...