NORTHRIDGE, Calif. and BUFFALO, N.Y. -- Helium, the second lightest element in the universe, has a variety of uses, from keeping balloons afloat to cooling superconducting magnets. It is also a noble ...

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If you take helium gas and you cool it at atmospheric pressure to 4.2 K it becomes a liquid. Keep cooling to 2.2 K and the helium enters its superfluid phase, called helium II. Superfluid helium has ...