In quantum mechanics, the Pauli exclusion principle states that two or more identical particles with half-integer spins (i.e. fermions) cannot occupy the same quantum state within a quantum system simultaneously.- Afton, Minnesota (Wikipedia)
Afton is a city in Washington County, Minnesota, United States. The population was 2,886 at the 2010 United States Census. It lies on a small bay where Valley Creek empties into the St. Croix River, several miles north of its confluence with the Mississippi River.