"Dr. Hal, what makes No. 2 pencils so damn special, and why aren't they No. 1?"
Answer:
The No. 2 is definitely No. 1 in the pencil market. A staple in schools and workplaces everywhere, it's the required writing utensil for Scantron tests across the globe. And it really is the best pencil. No. 2s use medium-weight graphite, which makes them the ideal pencils for general writing. Pencils are numbered according to the International Pencil Numbering System Concordat. This number system was established more than 200 years ago by the great 18th Century pencil maker (Fabricateur de Crayons) Nicholas-Jacques Conte. Monsieur Conte created the number system based on pencilian hardness: the higher the number, the harder the graphite. We've been using it ever since. Of course, No. 1s are useful, or were, in pre-computer times, for recording bowling scores. Now they are relegated to relative oblivion like the buggy whip and the ear trumpet.