Isaac Newton did not invent the gravity constant G, nor did he use it or need it. Newton’s original formula was F = Mm/r^2 and not the formula F = GMm/r^2 , which had evolved over time. Newton’s formula can easily be unified with quantum mechanics, while the modification to his formula can only be unified with quantum mechanics by introducing a very akward notation as shown in this paper. Modern physics indirectly uses two different definitions for mass without knowing it; one for gravity and another for the rest of physics. This, we will prove, has made it impossible to unify quantum mechanics with gravity. However, once we understand the cause of the problem, it can be fixed easily by going back to the key insight given by Newton, which leads to a beautiful simple unified theory, in both conception and notation. Alternatively, one can arrive at the same theory, but with unattractive notation that hides the beauty at the depth of reality. We will show a beautiful way to unify gravity and quantum mechanics and also an ugly way. Both are the essentially the same, but only one way, the Newton inspired way, gives the deep insight on matter, energy, time, space, and gravity and even quantum mechanics. Modern physics has ignored Newton’s insight on matter and altered the mass definition, and therefore Newton’s gravity formula was modified as well, such that a unified theory seemed to become impossible. Newton himself would probably not have approved of the gravity constant; it is a flaw on the foundation of his theory and his gravity formula. Still, when one understands what the gravity constant really represents, one can unify standard physics, by adding it in other places, as needed. As an example of its power, our new quantum gravity theory can predict galaxy rotation based on baryonic matter only. This strongly indicates that dark matter is an extraneous and awkward factor used in today’s standard gravity model in order to get an incomplete model to fit observations.