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TARDIS Index File

4H pencil

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The Tenth Doctor used a 4H pencil and a mug to demonstrate how the Huon particles in the heart of the TARDIS—the mug—were attracted to the identical particles in Donna Noble—the pencil. When Donna, shocked, questioned, "I'm a pencil inside a mug?" the Doctor joked, "Yes, you are. 4H — sums you up." (TV: The Runaway Bride)

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