COVID-19 has been bad. Many, likely millions of people, who have survived their COVID-battle, face a difficult array of symptoms. Breathing problems, joint pain, heart palpitations, brain fog are a few of them. This is part 1 of a three-part podcast series on long-COVID. You can also find my piece in Nature Methods on long-COVID here. Dr. Nadia Rosenthal, who directs science at the Jackson Laboratory, and her team are working on ways to model this diversity of symptoms, which can help figure out what is amiss in long-COVID and indicate how one might treat it.