But it will be found. . . that one universal law prevails in all these phenomena. Where two portions of the same light arrive in the eye by different routes, either exactly or very nearly in the same direction, the appearance or disappearance of various colours is determined by the greater or less difference in the lengths of the paths.
That's one component: rather than creating job-training pipelines that put these kids at the back of the line for the last century's pollution-based jobs, we need to be creating opportunities for them to be at the front of the line for the new clean and green jobs.