Michelle Johnston, an MS student in the University of Kentucky's Department of Earth & Environmental Sciences and a part-time employee of the CAER's Applied Petrology Laboratory working under the direction of Jim Hower, recently completed several weeks of study under the direction of Nikki Wagner at the University of Witwatersrand, South Africa.  Michelle studied the petrology of a suite of coals from  Botswana.  Nikki Wagner was on sabbatical leave at the CAER in the second half of 2011.