Comal in downtown Berkeley has a good solution, but it cost them a fortune. It’s a very pleasant space.
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A research team involving several universities including MIT found an interesting solution.
https://news.mit.edu/2024/sound-suppressing-silk-can-create-quiet-spaces-0507#:~:text=To%20cut%20through%20the%20din,voltage%20is%20applied%20to%20it.
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This is cool.
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