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Ancient Trees Show When The Earth’s Magnetic Field Last Flipped Out

Quoted: “That high-resolution temporal record is, I think, pretty impressive,” says Brad Singer, a geologist at the University of Wisconsin-Madison who studies the history of the Earth’s magnetic field but was not part of the research team. “This is only a small number of specimens that they measured, but the results look fairly reproducible in the different trees, and I think that’s a pretty impressive set of data.”