This NPR News Now episode covers Democratic primaries in Michigan and Wisconsin, featuring Mara Lyasson’s analysis of left-wing candidates’ viability. Dr. Ashish Jha discusses the ongoing mystery of COVID-19’s origins, while Terry Schultz reports on EU divisions over the Ceuta migrant crisis. The broadcast also highlights the rise of human composting as a green burial option and notes Spider-Man’s record-breaking box office debut.