Tracking Earth’s changing magnetic field using South African hut fires

One “fun fact” that emerges from geology is that the magnetic north pole hasn’t always been near the geographic North Pole—it also keeps a home near the geographic South Pole, which it occupies when the orientation of Earth's magnetic field flips. Although magnetic flips appear more or less randomly distributed through time, it’s tempting to think we’re overdue for a flip, given how long it has been since the last one (about 780,000 years). Add in observations showing...

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