Who put Native American sign language in the US mail?
In 1890, a strange letter with “hieroglyphic script” arrived at Pennsylvania’s Carlisle Indian Industrial School. It was sent from a reservation in the Oklahoma Territory to a Kiowa student named Belo Cozad. Cozad, who did not read or write in English, was able to understand the letter’s contents—namely, its symbols that offered an update about his family.