The petals of a range of flowers harbour repeated patterns of nanostructures that show similar levels of disorder across species. This degree of disorder produces a blue halo of scattered light that helps bees to find flowers. See Article p.469
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Deheyn, D. How flowers get the blues to lure bees. Nature 550, 467–468 (2017). https://doi.org/10.1038/nature24155
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DOI: https://doi.org/10.1038/nature24155