How WWI and WWII revolutionized period products

For centuries, menstruation was managed with homemade solutions--until the world changed in a hurry. Patented in 1931, the first Tampax tampons were sold in 1936 as the first widely marketed internal menstrual product. Breakthroughs, discoveries, and DIY tips sent every weekday. About half of us will use them at some point in our lives. But few of us like to talk about them, at least in public.