Glue is incredibly useful for a lot of different projects, but what did they use back before modern glue? In this series, I explain how adhesives were made in ancient times and find out which one works best. Let's put them to the test! Final results: Hide Glue: 220 lb Casein Glue: 145lb Caveman Glue: 50 lb Wheat-paste Glue: 30 lb