This reads: “Delta X times Delta P is always greater than or equal to h-bar divided by two.” This general property of reality is called “Heisenberg’s uncertainty principle.” It applies to everything. An immediate consequence is granularity. Light, for instance, is made of photons or grains of light, because portions of energy that were even more minute than this would violate this principle: the electric field and the magnetic field (that are like X and P, for light) would both be too determined and would violate the first postulate.
