How have scientists and artists reconstructed the extinct dinosaurs, and why have they remained so popular? Karen Chin, CU-Boulder associate professor of geological sciences and curator of paleontology, will discuss how our understanding of dinosaurs has changed since the first discoveries of dinosaur bones hundreds of years ago. Join Chin on Monday, April 21, at 7 p.m. at The Dairy Center for the Arts. Part of Science on Screen, the program will be followed by a special presentation of the 1925 classic film, “The Lost World.”