An idea that a mineral phase transition may occur not once, but twice, close to the core–mantle boundary has been tested with seismic data. The resulting picture of the deep Earth is sure to provoke debate.
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Wysession, M., Solomatov, V. Double-crossed again. Nature 434, 834–835 (2005). https://doi.org/10.1038/434834a
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DOI: https://doi.org/10.1038/434834a
