[1] How this 4D physics provides simple classical derivations of de Broglie hypothesis, Schrödinger equation and Coulomb’s law? [2] How the puzzle behind matter wave and dual nature of radiation is resolved? [3] Why there are two kinds of charges? [4] How nature dopes exactly equal amount charge (e) into fundamental particle of different mass? [5] How charge of a fundamental particle is forced to concentrate near a point where there are forces of repulsion between its constituent parts? [6] How proton mass is 1836 times the mass of electron? [7] How technique of two exactly reversible processes, emission and absorption of photon, is explained classically? [8] How repulsive Coulomb force becomes strong force as d2w/dx2 changes sign at the point of inflexion? [9] Why electron-positron pair annihilates but electron-proton pair forms a stable combination? [10] Why n-n or p-p combination is unstable in spite of strong attractive force, whereas n-p combination (deuteron) is stable? [11] How spin of a particle is attributed to the existence of extra space dimension? [12] How similar or dissimilar is our 4D universe with Einstein’s universe?

All these above can be explained intuitively or derived classically by this new 4d physics, whereas, our traditional 3d physics cannot achieve these feats. This fact, itself, is a strong proof that 4th space dimension exists.