“Non-Newtonian fluid” is just a fancy way of naming a liquid that gets thicker when you disturb it. The liquid in the video is a mixture of cornstarch and water. The videographer did something clever to remove the blur you'd expect: the video camera takes 30 frames per second, and the speaker is vibrating at 30 Hertz (cycles per second). The result is much like using a stroboscope...
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