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The Spinning Magnet: The Electromagnetic Force That Created the Modern World--and Could Destroy It, by Alanna Mitchell

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Knowing where you were depended on being able to adjust for the difference between magnetic north, where the compass pointed, and geographical north.

Ahmed Nabil

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The Spinning Magnet: The Electromagnetic Force That Created the Modern World--and Could Destroy It

The Spinning Magnet: The Electromagnetic Force That Created the Modern World--and Could Destroy It

by Alanna Mitchell

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