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[[File:2 Helium.png|thumb|[[Liquid helium]] retains [[kinetic energy]] and does not freeze regardless of temperature at standard atmospheric pressure ...d (physics)|force field]]s, whose quanta are [[boson]]s (e.g., [[photon]]s and [[gluon]]s). All these fields have zero-point energy.{{sfnp|Milonni|1994|p= ...