Seminar 1:  Methane cycling in Greenlandic thermokarst lakes as an analogue for ancient crater lakes on Mars Speaker:ProfessorLisa Pratt                 Department of Geological Sciences, Indiana University Seminar 2: An "unpleasant" answer to the "super-heavy pyrite" puzzle Speaker:Dr. Yongbo Peng                Department of Geological Sciences, Indiana University Time: May 26, 20143:00pm–5:00pm   Place:Lecture room of Library, NIGPAS