= Superfluid helium-3
{tag=1996 Nobel Prize in Physics}
{title2=observed 1972}
{wiki}
Surprisingly, it can also become a <superfluid> even though each atom is a <fermion>! This is because of <Cooper pair> formation, just like in <superconductors>, but the transition happens at lower temperatures than <superfluid helium-4>, which is a <boson>.
https://aps.org/publications/apsnews/202110/history.cfm[]: October 1972: Publication of Discovery of Superfluid Helium-3 contains comments on the seminal paper and a graph which we must steal.