A phenomenon (from Greek φαινόμενoν, pl. φαινόμενα - phenomena)'s any observable occurrence. In popular usage, a phenomenon often refers to an extraordinary event. In scientific usage, a phenomenon's any event that's observable, however commonplace it might be, even if it requires the use of instrumentation to observe it. For example, In physics, a phenomenon may be a feature of matter, energy, or spacetim… (More on Phenomenon)