Planck's Quantum hypothesis was dormant for over a decade until a new mystery emerged in the form of the photo-electric effect. If high frequency light falls on certain metals electrons are ejected from it which are moving much faster than predicted by the classical wave theory of light. Again, Classical Physics was faced with unexplainable experimental facts.
Nevertheless, amidst this seemingly hopeless situation Einstein suggested that Planck's mysterious Quanta, when applied to light energy, would explain the high velocities of the 'photo electrons'.
In this new corpuscular theory of light, the light-particle, later called Photon, instantaneously transmits its concentrated energy to the electron via collision.
A few years later, the 'Compton Effect' demonstrated that in the photon-electron collision the classical law of the conservation of momentum is preserved.
With this an even deeper mystery, the so-called 'dual nature of light' was established: In certain cases light behaves like waves (analogous to sound), in other cases it behaves like particles or bullets. This 'schizophrenic' duality of light still troubles modern science.
Aethro-Kinematics renders an alternate solution to the enigma of the Photoelectric and Compton Effects and re-establishes the clearly mechanical compression wave nature of light in the Aether. Planck's Quanta fits into this theory in a different way, giving the quantitative expression for the elastic nature of the Aether.