Why Do I Have to Use a Number 2 Pencil?

Описание: Why do exams always tell you to use a number 2 pencil? What happens if you don’t? Quick Questions explains!

Hosted by: Michael Aranda
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Sources:
http://www-03.ibm.com/ibm/history/ibm...
http://www.todayifoundout.com/index.p...
http://mentalfloss.com/article/24832/...
http://pencils.com/what-is-a-no-2-pen...
http://www.howeverythingworks.org/pag...