I do not think you can name many great inventions that have been made by married men.
Imagination is more important than knowledge.
You can literally see the wavelength of the sound
[Similar thing can be done with light.](https://phys.org/news/2010-07-nano-sized-mill-micro-sized-disk-video.html)
Somewhere there’s a picture of a little glass ball floating due to radiation pressure, but I can’t find it 🙁
What does he do at the end?
Is this loud?
Is that like la la la la la???
Could someone explain how this works?
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