This episode deals with glues and adhesives, from prehistoric times to the present. We talk of prehistoric glue from tree saps, petroleum tar, animal glues, casein glues, albumin glues, and starch glues, all known in ancient times. Medieval knowledge added fish glue, and by the Renaissance we start industrial-scale adhesive factories. The 19th century brought rubber cement, mucilage, and library paste. We talk of 20th-century products like white glue, epoxy, polyurethane glues, super glues, glue guns, glue sticks, and even Post-It Notes.

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