The pencil “lead” is actually a mixture of graphite and clay. More clay in the mixture makes the lead harder. A harder lead has a higher number. Pencils are numbered from 1-3 but most people use a ...
LOUISVILLE, Ky. — They’re at the top of the list for every back-to-school shopper: pencils. And not just any pencil will do—they’ve got to be No. 2 pencils. But, what the heck is a No. 2 pencil? And ...
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