Beyond the (visible) rainbow
Another, professional, interest in which I have invested a considerable amount of energy over the past three decades is the understanding of the structure of molecules that become attached (adsorbed) to the surface of a solid material. This understanding is important for such a diverse assortment of phenomena as the functioning of catalysts, the electrical properties of small integrated circuits, the separation of ores, and the processes that take place within a fusion reactor. It might seem that this interest would have nothing to do with rainbows, but not so.
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