In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.

This statement contributes to the repulsive one over r to the twelfth term in the Lennard-Jones Potential. Its rigorous statement requires that particles with half-integer spin have anti-symmetrical wave functions, and it also explains neutron degeneracy, which prevents smaller neutron stars from collapsing into black holes. The "+1" term seen in the denominator of the Fermi-Dirac distribution arises due to this statement, and bosons do not have to obey it, but fermions such as protons and electrons do. For 10 points, name this law of quantum mechanics, which states that no two identical fermions can occupy the same quantum state at the same time.
Science