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The water is waving around back and forth 24 times per second along with the 24 Hz sound wave, so to the human eye it would just look like it's diffusing randomly. By recording the water 24 times per second, though, you really only see the water in the same position during each of its "waves", so to the camera it looks like it's holding still in mid-air.
Leave it to Twitter and that stupid "I ****ing love science" Facebook group to strip science down to "OMG THIS LOOKS KEWL <3 IM SUCH A NERD LOL".
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