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Hi. It takes a lot of liquid helium, which incidentally is itself in a funny state (superfluid) :-).

@aramus thanks! I have just watched this video, the guy nailed it down ;-) Very good explanation of quantum mechanics and quite an entertaining one - mix helium 3, helium 4, pour in a U - tube, then use the same technique as with vodka distillation to bring helium 3 up, and the mixture sucks the temperature on the border between the two liquids.