I know we did this back in WWII but back then we retooled factories who were manufacturing one kind of vehicle to manufacturing another. I kind of get that. But today companies are retooling any manner of factories from manufacturing widget x to producing respirators. How does that work? What needs to happen in a factory to go from making something like pillows or pickup trucks to making respirators. I can't wrap my head around this. Is it as complicated and expensive as it seems or is is easier than it sounds?