Colophon

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The header image on the landing page is from "Optics: diagrams of reflection and refraction of light" which is part of the Wellcome Collection, and sourced via Wikimedia Commons: https://commons.wikimedia.org/wiki/File:Optics;_diagrams_of_reflection_and_refraction_of_light._Colo_Wellcome_V0025363.jpg. It is licensed under a Creative Commons Attribution 4.0 International License.