A drain acts as a waveguide for sound waves. This photo is one of my contributions.

Setreset's user page. My interests are mainly optics in medicine and aerospace, physics and science in general.

Main contributions in English Wikipedia

Enhanced flight vision system, Waveguide, Lattice QCD

Other Projects

I contributed a lot to these projects:

Allikas: https://en.wikipedia.org/wiki/User:Setreset
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