If sharks were around in the time of dinosaurs, how are they still here today when dinosaurs have gone extinct? Were some just really, really good at hiding from the asteroid that hit Earth? For this episode, we talked to Karen Chin, a professor of Geological Sciences at the University of Colorado.  Got a question you want to sink your teeth into? Send it to us at BrainsOn.org/contact, and we’ll try our best to fin-ish what you started!