Why Do I Have to Use a Number 2 Pencil?

The video explains the historical and technical reasons behind the use of #2 pencils in standardized tests. It covers the evolution of test scoring machines from electrical circuits to optical mark sensing devices, highlighting the role of graphite in pencils. The video also discusses how modern scoring machines have advanced, allowing for more flexibility in pencil usage, though it advises sticking to #2 pencils for important exams.

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