to the left of the paper guide, then a word processor will achieve the same centering throughout a given page and on different pages. The bloggers asserted that it is unlikely that two documents produced 3 months apart by a manual centering process would exactly overlap. In the Killian memos the text matches perfectly when overlaid with a word processor-produced 3 line address block, and between the 3- and 2- line blocks of different memos. Curved apostrophes In several places, the documents use apostrophes such as in the words I'm and won't. These are curved somewhat to the left, similar to the shape of a comma. Most typewriters of the era featured vertical apostrophes, rather than angled or curved ones. They were also used for both the opening and closing quotation mark embedded within another quotation instead of the curved forms available in modern day word processors. Compare the straight forms in The witness testified that "Jones yelled, 'Run!' before fleeing the scene" in court yesterday. to the curved forms in The witness testified that “Jones yelled, ‘Run!’ before fleeing the scene” in court yesterday. The latter requires two separate glyphs for each pair of single and double quotation marks. Similarity to contemporary documents The Washington Post reported that "of more than 100 records made available by the 147th Group and the Texas Air National Guard, none used the proportional spacing techniques characteristic of the CBS documents." This raises the question of the likelihood of a National Guard office having access to this type of equipment. According to The Washington Post, "The analysis shows that half a dozen Killian memos released earlier by the military were written with a standard typewriter using different formatting techniques from those characteristic of computer-generated documents. CBS's Killian memos bear numerous signs that are more consistent with modern-day word-processing programs, particularly Microsoft Word..." (September 14, 2004). Content and formatting In addition to typography, aspects of the memos such as the content and formatting have been challenged. Signatures Of the documents, only the May 4 memo bears a full signature. CBS stated that document examiner Marcel Matley had determined the signature was authentic. However, Matley told The Washington Post on September 14, "There's no way that I, as a document expert, can authenticate them" because they are copies far removed from the original source. Eugene P. Hussey, a certified forensic document examiner in Washington state, expressed