Omg lol, proof that someone ALWAYS has to say something negative. By the way, how do you know the salt was wasted? Maybe it is saved and reused to demonstrate this... it's beyond cool, it's awesome!

This is an awesome demonstration of how sound travels at various frequencies. What's particularly cool is how they illustrate it – using salt. 

This will become very important in the not so far future...think about it.  
Credits: brusspup via YouTube

Depending on the frequency that the plate is adjusted to, the salt contorts and conforms to various patterns. The symmetry is breathtaking.

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