Calculating the age of the Earth's solid inner core has proved to be a tricky business. But the suggestion that there is more potassium in the core than had been thought could help to reconcile differing estimates.
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Brodholt, J., Nimmo, F. Core values. Nature 418, 489–491 (2002). https://doi.org/10.1038/418489a
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DOI: https://doi.org/10.1038/418489a
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