All essays are living documents; that is to say, they are updated when more information or corrected information is obtained.  If you wish to know if an essay has new information in it since you last visited the site—look at the version date at the top right of each page of the PDF of that essay. If the current date is the same as the date you last looked at the essay—nothing has changed. When an essay is updated, the version date at the top of the PDF page will be changed.

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