Neutron stars are the most dense objects of normal matter in the universe, supported against gravitational collapse by subatomic forces.
However, it became a scientific issue with the advent of the theory of relativity and again with the discovery of phenomena at the subatomic level.
This is probably not a serious problem for banana salesmen, but could impact subatomic physicists, for example.
They move from the actual size of a leaf into a microscopic world that reveals leaf cell walls, the cell nucleus, chromatin, DNA and finally, into the subatomic universe of electrons and protons.
What impresses me is that if you look at the subatomic level, or the quantum level, what you find is that the information processing power of nature goes up exponentially.
But at the subatomic level, quantum mechanics has proven to be an indispensable tool in predicting often strange processes.
The uncertainty principle, derived from quantum mechanics, implies that at the subatomic level virtual particles, also called quantum fluctuations, pop in and out of existence.
Angular momentum is also important for scientists trying to understand subatomic physics.
At the other end of the scale of size, at the atomic and subatomic level, another great mystery resides.
The delineation of atomic substructure and mechanisms of subatomic processes evolved into the modern study of particle physics.