For more than half of the 20th century parents in the industrialized world were freaked out by an unseen waster of youth, the poliovirus. It spread easily and could paralyze children for life or even kill them. Its effects were so horrible that humanity set about ridding if from the Earth. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.