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deinonychus commented on the word third sound
From http://what-if.xkcd.com/50/: "Superfluid helium films, like the one rapidly covering you, carry the same types of ordinary sound waves that most materials do. But they also exhibit an additional type of wave, a slow-moving ripple that propogates along thin films of helium. It's only observed in superfluids, and has the mysterious and poetic name 'third sound.'"
December 18, 2015