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.

Why are #2 pencils specifically recommended for filling out answer sheets?

What was the innovation introduced by Reynold Johnson in 1931 regarding test scoring?

How do the properties of graphite make it suitable for optical mark sensing machines?

Explain the difference between #2 pencils and HB pencils in terms of their grading system.

What advancements have been made in scoring machines that allow for more flexibility in pencil usage?