Lead is a grey or silver-white soft metal. We've been using lead for thousands of years, because it's so useful. Unfortunately, lead is quite toxic to humans, which is why we have mostly replaced it ...

Plasma irradiation removes graphite from the pencil lead, exposing a thin layer of clay. By controlling the exposure time, the thickness of this layer can be varied to modulate the infrared (IR) ...

Discover how 19th-century graphite mines near Ticonderoga and Lake George fueled the Dixon pencil empire, creating company ...

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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The most important part of the setup is the pencil lead. The University of Missouri team behind the new study found that a 93-percent graphite mix was best for the job – the patterns this pencil lead ...

A challenging visual puzzle tasks readers with finding a tiny piece of pencil lead hidden within a patterned carpet image. This test of observation skills requires sharp attention to detail and the ...