(KUTV) For literally hundreds of years, they have been called "lead pencils," despite the fact that what is really inside them is graphite. According pencils.com, it all dates back to England in the ...

IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. This set of four short (less than 3-1 ...

Even if you're a pencil aficionado, you might find out something new from this video on the history of pencil lead from NPR. Like, for example, that Henry David Thoreau helped invent the numbering ...

If you enjoyed this article, I’d like to ask for your support. Scientific American has served as an advocate for science and industry for 180 years, and right now may be the most critical moment in ...