The Reversal of the North and South Poles

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Earth has this giant magnetic field, North Pole, South Pole. According to one estimate, about four to five times every million years or so on average, those poles flip. And when it flips, there's a period when the whole field gets much weaker and then sometimes it collapses and then it has to rebuild. So that means we're like really kind of exposed and vulnerable? Business skin. It's like a Y2K, but for composites.

This week, we tackle three listener questions — on sleepwalking, deja vu, and Earth’s magnetic field. Next time, we could be (not) answering yours. Email us at unexplainable@vox.com, or fill out this form.

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