Is the pencil an example of perfect design? What is the greatest pencil of all time? What does a fallen down tree in the Lake District have to do with its invention? 

Dallas talks to Caroline Weaver, pencil expert and author of “Pencils You Should Know: A History of the Ultimate Writing Utensil in 75 Anecdotes” about the origins of the pencil.

Edited by Tom Delargy, Produced by Freddy Chick, Senior Producer is Charlotte Long

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