Vibrations and how they get to your ears.
Noise for airports is a blog about culture, sound, music, and technology.
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Updated (sometimes) by Nick Seaver.

Not all of Thomas Edison’s inventions were as successful as the phonograph and the electric light. Apparently he also patented a “concrete piano,” with the idea that you could pour out just the shape you wanted.
Well, some folks took an upright and covered it in concrete. Video is apparently forthcoming (on YouTube and the Discovery Channel!), so for now you just get to admire a piano covered in wet cement.
(via Edison’s Concrete Piano)