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What swaying? Go back to the chalkboard, nerd.

Tell it like it is, Neil.

If you ever wondered how people got various substances to dance with sound, this is a perfect example of how cool the only liquid metal at room temperature can be. Despite its known health issues, mercury is used in everything from thermometers to advertisement signs. If you ever wondered why this reaction happens, this Gizmodo post about mercury and sound will give you all you everything you need to know.