From bird beaks to wrapping paper to bras, we follow the curious history of one of the most important defenses in our fight against COVID-19.

The Mask

Throughline is a time machine. Each episode, we travel beyond the headlines to answer the question, "How did we get here?" We use sound and stories to bring history to life and put you into the middle of it. From ancient civilizations to forgotten figures, we take you directly to the moments that shaped our world. Throughline is hosted by Peabody Award-winning journalist Rund Abdelfatah. Support public media by joining NPR+ at plus.npr.org. You’ll get perks for over 25 NPR podcasts, including sponsor-free listening for Throughline.