Physical laws are permanently observed. They are universal but not proven. Newton's universal law of gravitation and three laws of motion, derived from the observations and theories of Copernicus, Kepler, Galileo and others, were used to take astronauts to the moon and return them safely to earth. Theories about the origin of gravity and whether gravitational forces are fundamental, quantum, entropic, induced, emergent, curved spacetime or fields like electromagnetism are still being probed. General relativity is a geometric theory, not a law, about gravity. In a book called Zero to Infinity: The Foundations of Physics Peter Rowlands asserts that physics is "founded entirely on the principle of duality." Wave-particle duality is one of the most fundamental representations of quantum objects. Photons, electrons, neutrinos and even molecules have been shown to be in superposition and entangled. This paper will examine the role that quantum entanglement plays in the fermion/boson relationship of Rowlands' nilpotent Dirac equation. Many other entangled physical dualities, identified as being foundational to physics, strongly suggest that his 'principle of duality' should be promoted into a physical law.