The Research Highlight 'Aluminium arches' (Nature 461, 318; 2009) incorrectly referred to an aluminium powder used in the experiment. In fact, an aluminium oxide powder, alumina, was used.
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The online version of the original article can be found at 10.1038/461318d
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Correction. Nature 461, 451 (2009). https://doi.org/10.1038/461451g
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DOI: https://doi.org/10.1038/461451g
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