Tuesday, January 17, 2017

Geek Trivia: The Pencil Grading Scale (Which Labels Pencils #1-4) Was Invented By?

The Pencil Grading Scale (Which Labels Pencils #1-4) Was Invented By?
  1. Benjamin Franklin
  2. Henry David Thoreau
  3. Mark Twain
  4. Andrew Johnson

Think you know the answer?

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