Multi-scale modelling of the deformation of magnesium oxide reveals the need for a re-examination of the way in which laboratory data are used to estimate the strength of Earth's lower mantle. See Letter p.177
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Walker, A. Limits of the power law. Nature 481, 153–154 (2012). https://doi.org/10.1038/481153a
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DOI: https://doi.org/10.1038/481153a
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