Why did quantum mechanics come into existence?

The birth of quantum mechanics was with the exploration into the realm of dual existence. Young's double slit experiment, for example, was a very important milestone. It showed that light, which had so long been believed to follow straight lines, ie the theory of rectilinear propagation of light, could also behave like a wave. read more

Quantum mechanics came up with ideas that bullshitted all this, and while it seems unnatural to most, we must realise that it is only so because we have defined classical physics to be the normal. read more

And if there is a God, quantum mechanics is a mechanism that allows for free will and a portal for God to intercede in a small way, because it is not deterministic. I did not think of it as God playing dice and being cruel to us. Prior to quantum mechanics, the Newtonian laws of physics was very much deterministic. read more

The whole Universe - and even multiverse, if one exists - obeys the laws of quantum mechanics. One of the postulates of quantum mechanics - that are universally valid - is that for any pair of states in the Hilbert space, their general complex linear superpositions are possible states as well. read more