[Mizza]

I feel like a lot of the comments here are missing the point because this isn't a magic noise-cancelling material.

The neat thing about this is that it works while still allowing air to flow through. Even if it's not blocking broad spectrum sound, it's still useful to block specific narrow frequency ranges. One immediate application mentioned in the article is for drones, which are very loud. Maybe if you put these devices below the fans of a drone, you could make it run much quieter.

It also establishes acoustic metamaterials as a new field of study, so we could soon see significant improvements in this technology - imagine a dynamic version of these rings which can change the frequencies which they block.