Liquid means chaos. Crystal means order. Zero entropy means complete and total order. Zero temperature means zero entropy.
How?
Zero temperature does not mean zero entropy.
Zero temperature means that you can add entropy to a system without adding energy. The S vs E graph is vertical.
So you could have some inherent disorder at zero temp if there is no more ordered state accessible to the system.
Funny--I'd expect the vodka to make them friendlier.
To add to M. Bekki's answer.
Those He atoms are drunk on Smirnoff. As we all know, this acts as an anti-freeze. But in this case, the He atoms simply don't like each other and the Smirnoff makes it more so. They have limited attraction for each other in the first place -- being noble gas and all, and as they cool, the mild repulsion caused by quantum effects is stronger than the forces which would cause them to solidify (probably in some sort of hexagonal close packing). This means their zero point energy goes down as their inter-atomic distances increase.
Take away their vodka and the He atoms might be able to solidify into something, but until then, they will happily keep their distance from each other forming a liquid instead of a solid.
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