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get_the_author_email outputs the post author’s email and the “80†is the size of the avatar image in pixels & it has to be in the loop!
URL: http://themeshaper.com/how-to-add-gravatars-for-the-post-author-in-wordpress/
URL: http://themeshaper.com/how-to-add-gravatars-for-the-post-author-in-wordpress/