Today I discovered

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You can see the wavelength of the vibrations of metal by tapping a whisk full of pancake batter on the side of the bowl. Little bumps of batter form as the crests of the wave. I thought it was really cool, but my husband wasn't impressed.

I would be! It sounds cool, I'll probably try it.

I was playing with a whisk at work today. I'd stir the mixture until it was a mini whirlpool and then I'd stop stirring and move my whisk in the opposite direction of the former spinning. I liked the feel of the resistance.

if you take a pair of tweezers, squeeze them together and let them snap open - while they're vibrating, position them in front of your eyes at a comfortable distance between your eyes and the TV (while on) or a computer screen.

As a kid I liked to wave my hand in front of the tv, very cheap entertainment
Maybe it was more interesting that the show!

Sorry if the next paragraph sounds odd, english isn't my native language:
The other day I saw a very beautiful "water wave" when I put a plastic spoon down in the water flowing from the faucet in the kitchen sink.
I even thought of getting a camera to upload it to Youtube! hehe

Cool! I need to make pancake batter ASAP.