in De discipline scholarum, a guidebook made in the 1230s for students and teachers at the University of Paris, it is explained how a student should bring such slips of parchment to class for taking notes. Interestingly, some of these slips have survived because they were pasted in a student’s textbook, like the one seen in the image above. These are truly the medieval equivalent of our “yellow sticky notes.” The practice of bringing scrap material into the classroom was a much broader medieval phenomenon, as is shown by the famous birch bark notes that survive from 13th-century Russia.