are extreme individuals.
No matter how hard you try, you will not get two of them to do the same thing in the same Place—there must always be a Difference between them.
Bosons, on the other hand, have no such constraint and are happy to join each other in a common dance.
This is why electrons, which are fermions, sit on separate shells around atomic nuclei. If they were bosons, they would instead sit together on the same shell, leaving the universe without chemistry—and without chemists, as our own Existence rests on the little fermions’ refusal to share Space.
~
HOSSENFELDER, Sabine, 2018. Lost in math: how beauty leads physics astray. New York: Basic Books. ISBN 978-0-465-09425-7, p. 11.
DOT FROM lambda-browsing