We’ve all run through the house if we forget something the second we are walking out the door, especially during COVID you’re in need of a checklist before you even leave. But do we even know what we’re walking through? How can we prevent walking through our houses with dirty shoes? We’re putting our foot down and spoke with Dr Gabriel Filippelli, Chancellor’s Professor Department of Earth Sciences, Indiana University-Purdue University Indianapolis (IUPUI) Executive Director, Indiana University.