Pencils - S4.E8 - Inside the Factory
Gregg Wallace is in Germany at a historic pencil factory where they produce 600,000 writing implements a day. Cherry Healey examines the astonishing properties of graphite. Historian Ruth Goodman traces the origin of pencils to a 15th-century graphite discovery in the Borrowdale valley.
Pencils - S4.E8 - Inside the Factory
March 19, 2019
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