Ventilators — maybe the biggest supply and demand problem of the COVID pandemic. And American businesses are rising to meet the challenge. To avoid the worst case scenario of the COVID-19 pandemic, America will need more ventilators, maybe hundreds of thousands of new ones in the coming months. Across the country companies that normally make things like auto parts are turning on a dime, racing to make ventilator parts. In this bonus episode of NPR's Planet Money podcast, Karen Duffin and Kenny Malone take us up close and inside the scramble to manufacture just one of those hundreds of parts.