= Grammar & punctuation = Articles on grammar and punctuation rules. [[http://www.slate.com/articles/technology/technology/2011/01/space_invaders.html|Two spaces after a period: Why you should never, ever do it.]] [[http://www.slate.com/articles/life/the_good_word/2011/05/the_rise_of_logical_punctuation.html|Logical punctuation: Should we start placing commas outside quotation marks?]]. aka "logical punctuation", keeping in line with the "principle of minimal change". Spaces around an em dash — are considered "American".