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October 14, 2016 03:51 am PDT
Original Link: http://feeds.boingboing.net/~r/boingboing/iBag/~3/pwL1yqz36rk/a-brief-history-of-pencil-lead.html
A brief history of pencil lead
Courtesy of the YouTube channel Skunk Bear.
Original Link: http://feeds.boingboing.net/~r/boingboing/iBag/~3/pwL1yqz36rk/a-brief-history-of-pencil-lead.html
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