A superfluid is one which exhibits zero viscosity. There are a few examples, but the phenomenon was first observed with very very cold liquid helium. Helium boils (ie. becomes a gas from the liquid phase) at -268.9'C, which is a coooool 4'C above absolute zero. So this is cold. When it's being cooled, the helium condenses and you can see it boiling pretty violently, but when it cools further, it just stops and becomes very very still. This is Helium in it's superfluid state. It's zero viscosity
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