Geek Trivia: The Pencil Grading Scale (Which Labels Pencils #1-4) Was Invented By? 03:51:00 The Pencil Grading Scale (Which Labels Pencils #1-4) Was Invented By? Benjamin Franklin Henry David Thoreau Mark Twain Andrew Johnson Think you know the answer? from How-To Geek http://ift.tt/2jU8PtK via IFTTT Twitter Facebook Google Tumblr Pinterest
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