On December 14, 1900 physics was revolutionized communication with the German physicist Max Planck. That day he established the initial framework of quantum theory.
In the early Twentieth Century ideas about how atoms were made up were changing. The previously upheld belief that atoms were spheres of positive charge with negatively charged electrons stuck in them was replaced by a model similar to that of a tiny solar system. In this new model atoms were explained as consisting of a tiny nucleus at the centre with a very large charge density made of positively charged protons and uncharged neutrons, around which there are negatively charged electrons.
Is it true, that when (other things being equal) given a choice of explanations for something that the simplest explanation is most often the best? Being of medieval origin, should this principle of simplicity still be elevated to such an important part of our scientific approach, today?