The Obituary for David Sayre (Nature 484, 38; 2012) incorrectly implied that he suggested focusing X-rays using Fresnel zone plates. In fact, his contribution was the use of nanofabrication to make the plates.
The online version of the original article can be found at 10.1038/484038a
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Correction. Nature 487, 302 (2012). https://doi.org/10.1038/487302f
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