Plank, in 1901, introduced discreteness or quanta into the hitherto continuous world of
Newton. In so doing he opened the door to the complete replacement of Newton's rules
of mechanics by what is naturally called quantum mechanics, in which the certain world
we see around us is replaced by one in which nothing is certain, nothing is as it seems.
We now know that all matter is composed of waves of probability, and the certitude of
the classical world has vanished.