Our planet’s northern magnetic pole is not only racing toward Siberia at about 34 miles per year, it has been to Antarctica several times in the last million years—and it’s due to flip again. This isn ...

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When it Came to metal fish which pointed north, the Chinese were, as usual, ahead of the game. In the 11th century, writers noted that thin, magnetised iron strips would, if floated in water, swivel ...