Busy busy busy! Atlanta tomorrow! Here’s a quick photo from my research: the special tubes I use for NMR. (Read a bit more about nuclear magnetic resonance spectroscopy here, in case you missed my earlier post.) They are thin glass, and uniformly thick. This is necessary so that they are able to spin perfectly evenly at a regular rate in the NMR itself, usually at a rate of 20 Hz. The picture shows some samples of humic substances, the result of the breakdown of organic matter (aka the major component of soil).