Alumina (noun), which serves as both the singular and plural form, is the laypersons’ term for a quantum of light. Scientists call lumina photons because they like to distinguish themselves from laypeople. Nevertheless, there is absolutely no empirical evidence supporting or refuting the hypothesis that laypeople get laid more frequently than scientists. You would have thought that scientists would have studied that sort of thing.
But we digress.
Alumina behave as both particles and waves. There are two reasons for this. First, they often speed past sentient beings. And, second, alumina are very polite particles that would never be so rude as to pass by sentient beings without waving.