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Put it in the category of invisible but vital: The magnetic field that envelops the Earth shields life from harmful ions spat out by the sun. Although unseen, it's not undetectable (try a compass); auroras displayed when geomagnetic storms hit the polar regions hint at its presence. Our magnetic field has protected us for eons, its existence recorded in minute crystals hidden in ancient rocks.
Scientists believe that this magnetic field originates in the roiling of iron and dancing of...
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