They are health care's freelancers, reinforcements who have been crucial to helping short-handed nursing staffs during the COVID-19 pandemic. And you probably haven't even heard of them. In this episode, host and NewsMD Health Correspondent Jeremy Fugleberg talks with Professor Joshua Gottlieb, a nursing markets researcher at the University of Chicago, to get some answers about why traveling nurses are so important, and why they can get paid top dollar for what they do.