His incessant curiosity inspires David Hu to search for the physics among water-walking geckos, bridge-building ants..and urinating zoo animals. Hu, an assistant professor in the School of Biological Sciences, has a joint appointment with the George W. Woodruff School of Mechanical Engineering. This conversation is an edited excerpt from the Uncommon Engineer podcast. (Our thanks to Steven McLaughlin, Dean of the College of Engineering.)