what is pencil lead number 2 A Sketchy History Of Pencil Lead | NPR's SKUNK BEAR

A question from the 5th graders at Green Acres School in Lebanon, OR sent us on a quest to find the origin of pencil lead.
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More about the fascinating history of pencils here: http://www.npr.org/sections/ed/2016/0...

Credits:
Produced by Ryan Kellman and Adam Cole
Senior Editor: Alison Richards
Supervising Editor: Anne Gudenkauf
Production assistance: Bronson Arcuri, Elissa Nadworny

Additional images by:
Gerhard Boeggemann
NASA, ESA, F. Summers, Z. Levay, L. Frattare, B. Mobasher, A. Koekemoer and the HUDF Team (STScI).


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what is pencil lead number 2 A Sketchy History Of Pencil Lead | NPR's SKUNK BEAR
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Science & Technology	Upload TimePublished on 11 Oct 2016

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