We take it for granted but think about it – it’s amazing that a metal pencil can interfere with the #earth magnetic field. Powerful pencil.

We take it for granted but think about it – it’s amazing that a metal pencil can interfere with the #earth magnetic field. Powerful pencil.


We take it for granted but think about it – it’s amazing that a metal pencil can interfere with the #earth magnetic field. Powerful pencil.

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