For any of you samplers out there, here's something potentially interesting: a recording I made (3.1 MB flac format, 49 sec) of the sound of a chunk of silica aerogel clattering and bouncing on a hard surface after being dropped from a few inches' height, repeatedly. Weird, eh? Feel free to use it according to the Creative Commons Attribution 3.0 United States License. I'd love to hear about any uses you make of it.