This is freaky stuff. Who knew?

Beginning in 1946 and continuing into the 1960s, Disney gave young women the “talk” about their periods with an educational animated short titled The Story of Menstruation. The 10-minute stylized animation, produced by Walt Disney Productions, was backed by the company behind tampon brand Kotex (then it was the International Cello-Cotton Company, now it’s Kimberly-Clark). Kotex boasts that it taught 105 million girls, in health education classes across the United States, about puberty and good ol’ Aunt Flo.

Read more: Dangerous Minds