Dinosaur expert speaks Thursday "How do we know what we know about dinosaurs?" will be presented by Mary Schweitzer, associate professor of Marine, Earth And Atmospheric Sciences at North Carolina State University. She will speak at noon Thursday, May 1, in 100 Leonard Hall at the University of North Dakota. Schweitzer is a graduate of the biology program at Montana State University, and is an expert in molecular paleontology, which is the preservation and detection of original molecular fragments in well-preserved fossil specimens. Everyone is welcome to the talk, which is part of the UND geology department's Leading Edge of Earth and Planetary Sciences (LEEPS) lecture series. For more information, contact Joseph Hartman, associate professor of geology at UND, 701-777-5055.