Do budding geologists like rock hammers? [more inside]
posted by DU on Sep 11, 2009 - 20 answers

What the hell is going on in this video? [more inside]
posted by tylerfulltilt on Jan 28, 2009 - 5 answers

Do you know what this tool is? [more inside]
posted by hyperfascinated on May 11, 2006 - 17 answers