Why don't you see No. 1 or No. 3 pencils on your back-to-school checklist? Here's why the No. 2 is the Goldilocks of writing utensils.

But it ain't cheap — the Apple Number 2 Pencil costs $215, which is a $136 premium over the 2nd-generation Apple Pencil, currently priced at $79. Still, it's undeniably adorable and could be a ...

No.2 pencils are widely used, but you may not know what the number actually refers to. This video explains how pencils developed into their modern form and the significance of the labeled numbers ...